Failed to complete lifecycle event CONSTRUCT

[Rudra Mathe]

Hello I was recently coding on MC version 1.16.4 and at the starting the client launched successfully but after some coding i got the error {

[13:12:57] [modloading-worker-1/DEBUG] [ne.mi.fm.ja.FMLModContainer/LOADING]: Firing event for modid forge : FMLConstructModEvent
[13:12:57] [modloading-worker-1/DEBUG] [ne.mi.fm.ja.FMLModContainer/LOADING]: Fired event for modid forge : FMLConstructModEvent
[13:12:58] [Render thread/FATAL] [ne.mi.fm.ModLoader/LOADING]: Failed to complete lifecycle event CONSTRUCT, 1 errors found
[13:12:58] [Render thread/WARN] [minecraft/GameSettings]: Removed resource pack mod_resources from options because it doesn't seem to exist anymore
[13:12:58] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.sound.SoundLoadEvent to a broken mod state
[13:12:59] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.ColorHandlerEvent$Block to a broken mod state
[13:12:59] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.ColorHandlerEvent$Item to a broken mod state
[13:13:02] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.ParticleFactoryRegisterEvent to a broken mod state
[13:13:02] [Render thread/INFO] [mojang/NarratorWindows]: Narrator library for x64 successfully loaded
[13:13:03] [Render thread/INFO] [minecraft/SimpleReloadableResourceManager]: Reloading ResourceManager: Default, Programmer Art
[13:13:04] [Worker-Main-4/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.ModelRegistryEvent to a broken mod state
[13:13:07] [Worker-Main-5/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state

Process finished with exit code -1}

Please help me with this

[poopoodice]

Please provide a repo.

[Rudra Mathe]

ok

 

[Rudra Mathe]

[19:45:13] [modloading-worker-1/INFO] [ne.mi.co.ForgeMod/FORGEMOD]: Forge mod loading, version 35.1.4, for MC 1.16.4 with MCP 20201102.104115
[19:45:13] [modloading-worker-1/INFO] [ne.mi.co.MinecraftForge/FORGE]: MinecraftForge v35.1.4 Initialized
[19:45:13] [modloading-worker-3/DEBUG] [ne.mi.fm.ja.FMLModContainer/LOADING]: Loading mod instance examplemod of type com.example.examplemod.ExampleMod
[19:45:13] [modloading-worker-1/ERROR] [ne.mi.fm.ja.FMLModContainer/LOADING]: Failed to create mod instance. ModID: forge, class net.minecraftforge.common.ForgeMod
java.lang.IllegalArgumentException: Invalid UUID string: 7f6587346f57-43f6h573jd-4gi54398
    at java.util.UUID.fromString(UUID.java:194) ~[?:1.8.0_275] {}
    at com.google.gson.internal.bind.TypeAdapters$24.read(TypeAdapters.java:566) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.internal.bind.TypeAdapters$24.read(TypeAdapters.java:559) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:186) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:145) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.Gson.fromJson(Gson.java:887) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.Gson.fromJson(Gson.java:852) ~[gson-2.8.0.jar:?] {}
    at net.minecraftforge.common.UsernameCache.load(UsernameCache.java:166) ~[forge:?] {re:classloading}
    at net.minecraftforge.common.MinecraftForge.initialize(MinecraftForge.java:54) ~[forge:?] {re:classloading}
    at net.minecraftforge.common.ForgeMod.<init>(ForgeMod.java:110) ~[forge:?] {re:classloading}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_275] {}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_275] {}
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_275] {}
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_275] {}
    at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_275] {}
    at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[forge:35.1] {re:classloading}
    at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[forge:?] {re:classloading}
    at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640) [?:1.8.0_275] {}
    at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1632) [?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) [?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) [?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175) [?:1.8.0_275] {}
[19:45:13] [modloading-worker-3/ERROR] [ne.mi.fm.ja.FMLModContainer/LOADING]: Failed to create mod instance. ModID: examplemod, class com.example.examplemod.ExampleMod
java.lang.ExceptionInInitializerError: null
    at com.example.examplemod.main.Registration.registerAll(Registration.java:18) ~[?:?] {re:classloading}
    at com.example.examplemod.ExampleMod.<init>(ExampleMod.java:35) ~[?:?] {re:classloading}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_275] {}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_275] {}
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_275] {}
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_275] {}
    at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_275] {}
    at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[forge:35.1] {re:classloading}
    at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[forge:?] {re:classloading}
    at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640) [?:1.8.0_275] {}
    at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1632) [?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) [?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) [?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175) [?:1.8.0_275] {}
Caused by: java.lang.IllegalStateException: Duplicate entry for static tag collection: minecraft:item
    at net.minecraft.tags.TagRegistryManager.create(TagRegistryManager.java:20) ~[forge:?] {re:classloading}
    at com.example.examplemod.main.ModItems.<clinit>(ModItems.java:12) ~[?:?] {re:classloading}
    ... 15 more
[19:45:13] [Render thread/FATAL] [ne.mi.fm.ModLoader/LOADING]: Failed to complete lifecycle event CONSTRUCT, 2 errors found
[19:45:13] [Render thread/WARN] [minecraft/GameSettings]: Removed resource pack mod_resources from options because it doesn't seem to exist anymore
[19:45:13] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.sound.SoundLoadEvent to a broken mod state
[19:45:14] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.ColorHandlerEvent$Block to a broken mod state
[19:45:14] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.ColorHandlerEvent$Item to a broken mod state
[19:45:17] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.ParticleFactoryRegisterEvent to a broken mod state
[19:45:18] [Render thread/INFO] [mojang/NarratorWindows]: Narrator library for x64 successfully loaded
[19:45:18] [Render thread/INFO] [minecraft/SimpleReloadableResourceManager]: Reloading ResourceManager: Default, Programmer Art
[19:45:20] [Worker-Main-6/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.ModelRegistryEvent to a broken mod state
[19:45:23] [Worker-Main-5/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state
[19:45:35] [Worker-Main-4/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state
[19:45:49] [Worker-Main-6/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state
[19:45:49] [Worker-Main-7/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state
[19:45:51] [Worker-Main-6/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state
[19:45:52] [Worker-Main-6/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state
[19:45:52] [Worker-Main-6/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state
[19:45:52] [Worker-Main-6/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state
[19:45:52] [Worker-Main-6/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state
[19:45:52] [Worker-Main-6/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Pre to a broken mod state
[19:45:52] [Render thread/DEBUG] [ne.mi.fm.ForgeI18n/CORE]: Loading I18N data entries: 5046
[19:45:53] [Render thread/INFO] [minecraft/SoundSystem]: OpenAL initialized.
[19:45:53] [Render thread/INFO] [minecraft/SoundEngine]: Sound engine started
[19:45:56] [Render thread/INFO] [minecraft/AtlasTexture]: Created: 1024x512x4 minecraft:textures/atlas/blocks.png-atlas
[19:45:56] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Post to a broken mod state
[19:45:56] [Render thread/INFO] [minecraft/AtlasTexture]: Created: 256x128x4 minecraft:textures/atlas/signs.png-atlas
[19:45:56] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Post to a broken mod state
[19:45:56] [Render thread/INFO] [minecraft/AtlasTexture]: Created: 512x512x4 minecraft:textures/atlas/banner_patterns.png-atlas
[19:45:56] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Post to a broken mod state
[19:45:56] [Render thread/INFO] [minecraft/AtlasTexture]: Created: 512x512x4 minecraft:textures/atlas/shield_patterns.png-atlas
[19:45:56] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Post to a broken mod state
[19:45:56] [Render thread/INFO] [minecraft/AtlasTexture]: Created: 256x256x4 minecraft:textures/atlas/chest.png-atlas
[19:45:56] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Post to a broken mod state
[19:45:56] [Render thread/INFO] [minecraft/AtlasTexture]: Created: 512x256x4 minecraft:textures/atlas/beds.png-atlas
[19:45:56] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Post to a broken mod state
[19:45:56] [Render thread/INFO] [minecraft/AtlasTexture]: Created: 512x256x4 minecraft:textures/atlas/shulker_boxes.png-atlas
[19:45:56] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Post to a broken mod state
[19:45:58] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.ModelBakeEvent to a broken mod state
[19:46:00] [Render thread/INFO] [minecraft/AtlasTexture]: Created: 256x256x0 minecraft:textures/atlas/particles.png-atlas
[19:46:00] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Post to a broken mod state
[19:46:00] [Render thread/INFO] [minecraft/AtlasTexture]: Created: 256x256x0 minecraft:textures/atlas/paintings.png-atlas
[19:46:00] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Post to a broken mod state
[19:46:00] [Render thread/INFO] [minecraft/AtlasTexture]: Created: 128x128x0 minecraft:textures/atlas/mob_effects.png-atlas
[19:46:00] [Render thread/ERROR] [ne.mi.fm.ModLoader/]: Cowardly refusing to send event net.minecraftforge.client.event.TextureStitchEvent$Post to a broken mod state
[19:46:00] [Render thread/DEBUG] [ne.mi.fm.ForgeI18n/CORE]: Loading I18N data entries: 4974
[19:46:00] [Render thread/INFO] [STDOUT/]: [net.minecraft.crash.CrashReport:makeCategoryDepth:227]: Negative index in crash report handler (21/23)
[19:46:00] [Render thread/FATAL] [ne.mi.fm.cl.ClientModLoader/]: Crash report saved to .\crash-reports\crash-2021-02-08_19.46.00-fml.txt

 

 

*Finished

Edited February 8, 2021 by diesieben07
spoiler

[Rudra Mathe]

*Crash Report

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 8/2/21 7:46 PM
Description: Mod loading error has occurred

java.lang.Exception: Mod Loading has failed
    at net.minecraftforge.fml.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:85) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
    at net.minecraftforge.fml.client.ClientModLoader.completeModLoading(ClientModLoader.java:188) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.lambda$null$1(Minecraft.java:513) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.util.Util.acceptOrElse(Util.java:323) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
    at net.minecraft.client.Minecraft.lambda$new$2(Minecraft.java:509) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.ResourceLoadProgressGui.render(ResourceLoadProgressGui.java:113) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.GameRenderer.updateCameraAndRender(GameRenderer.java:492) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1002) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.run(Minecraft.java:612) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(Main.java:184) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_275] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_275] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_275] {}
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_275] {}
    at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:52) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.6.jar:?] {}
    at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:105) [forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {}

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
    at java.util.UUID.fromString(UUID.java:194) ~[?:1.8.0_275] {}
-- MOD forge --
Details:
    Mod File: forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar
    Failure message: Forge (forge) has failed to load correctly
        java.lang.IllegalArgumentException: Invalid UUID string: 7f6587346f57-43f6h573jd-4gi54398
    Mod Version: 35.1.4
    Mod Issue URL: http://www.minecraftforge.net/
    Exception message: java.lang.IllegalArgumentException: Invalid UUID string: 7f6587346f57-43f6h573jd-4gi54398
Stacktrace:
    at java.util.UUID.fromString(UUID.java:194) ~[?:1.8.0_275] {}
    at com.google.gson.internal.bind.TypeAdapters$24.read(TypeAdapters.java:566) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.internal.bind.TypeAdapters$24.read(TypeAdapters.java:559) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:186) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:145) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.Gson.fromJson(Gson.java:887) ~[gson-2.8.0.jar:?] {}
    at com.google.gson.Gson.fromJson(Gson.java:852) ~[gson-2.8.0.jar:?] {}
    at net.minecraftforge.common.UsernameCache.load(UsernameCache.java:166) ~[forge:?] {re:classloading}
    at net.minecraftforge.common.MinecraftForge.initialize(MinecraftForge.java:54) ~[forge:?] {re:classloading}
    at net.minecraftforge.common.ForgeMod.<init>(ForgeMod.java:110) ~[forge:?] {re:classloading}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_275] {}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_275] {}
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_275] {}
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_275] {}
    at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_275] {}
    at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[forge:35.1] {re:classloading}
    at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[forge:?] {re:classloading}
    at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640) ~[?:1.8.0_275] {}
    at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1632) ~[?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) ~[?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) ~[?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) ~[?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175) ~[?:1.8.0_275] {}

-- MOD examplemod --
Details:
    Caused by 0: java.lang.ExceptionInInitializerError
        at com.example.examplemod.main.Registration.registerAll(Registration.java:18) ~[?:?] {re:classloading}
        at com.example.examplemod.ExampleMod.<init>(ExampleMod.java:35) ~[?:?] {re:classloading}
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_275] {}
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_275] {}
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_275] {}
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_275] {}
        at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_275] {}
        at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[forge:35.1] {re:classloading}
        at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[forge:?] {re:classloading}
        at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640) ~[?:1.8.0_275] {}
        at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1632) ~[?:1.8.0_275] {}
        at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) ~[?:1.8.0_275] {}
        at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) ~[?:1.8.0_275] {}
        at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) ~[?:1.8.0_275] {}
        at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175) ~[?:1.8.0_275] {}

    Mod File: main
    Failure message: Example Mod (examplemod) has failed to load correctly
        java.lang.ExceptionInInitializerError: null
    Mod Version: NONE
    Mod Issue URL: http://my.issue.tracker/
    Exception message: java.lang.IllegalStateException: Duplicate entry for static tag collection: minecraft:item
Stacktrace:
    at net.minecraft.tags.TagRegistryManager.create(TagRegistryManager.java:20) ~[forge:?] {re:classloading}
    at com.example.examplemod.main.ModItems.<clinit>(ModItems.java:12) ~[?:?] {re:classloading}
    at com.example.examplemod.main.Registration.registerAll(Registration.java:18) ~[?:?] {re:classloading}
    at com.example.examplemod.ExampleMod.<init>(ExampleMod.java:35) ~[?:?] {re:classloading}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_275] {}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_275] {}
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_275] {}
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_275] {}
    at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_275] {}
    at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[forge:35.1] {re:classloading}
    at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[forge:?] {re:classloading}
    at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640) ~[?:1.8.0_275] {}
    at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1632) ~[?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) ~[?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) ~[?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) ~[?:1.8.0_275] {}
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175) ~[?:1.8.0_275] {}

-- System Details --
Details:
    Minecraft Version: 1.16.4
    Minecraft Version ID: 1.16.4
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_275, AdoptOpenJDK
    Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), AdoptOpenJDK
    Memory: 379977000 bytes (362 MB) / 942669824 bytes (899 MB) up to 1881145344 bytes (1794 MB)
    CPUs: 4
    JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
    ModLauncher: 8.0.6+85+master.325de55
    ModLauncher launch target: fmluserdevclient
    ModLauncher naming: mcp
    ModLauncher services: 
        /mixin-0.8.2.jar mixin PLUGINSERVICE 
        /eventbus-3.0.5-service.jar eventbus PLUGINSERVICE 
        /forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-launcher.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-launcher.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-2.2.0-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-launcher.jar capability_inject_definalize PLUGINSERVICE 
        /forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-launcher.jar runtimedistcleaner PLUGINSERVICE 
        /mixin-0.8.2.jar mixin TRANSFORMATIONSERVICE 
        /forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-launcher.jar fml TRANSFORMATIONSERVICE 
    FML: 35.1
    Forge: net.minecraftforge:35.1.4
    FML Language Providers: 
        [email protected]
        minecraft@1
    Mod List: 
        client-extra.jar                                  |Minecraft                     |minecraft                     |1.16.4              |CREATE_REG|a1:d4:5e:04:4f:d3:d6:e0:7b:37:97:cf:77:b0:de:ad:4a:47:ce:8c:96:49:5f:0a:cf:8c:ae:b2:6d:4b:8a:3f
        forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.|Forge                         |forge                         |35.1.4              |ERROR     |NOSIGNATURE
        main                                              |Example Mod                   |examplemod                    |NONE                |ERROR     |NOSIGNATURE

Edited February 8, 2021 by diesieben07
spoiler

[Rudra Mathe]

Here's the main mod class:-

[Rudra Mathe]

*ModItem

package com.example.examplemod.main;

import com.example.examplemod.ExampleMod;
import net.minecraft.item.Item;
import net.minecraft.tags.*;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.fml.RegistryObject;

import java.util.List;

public class ModItems {
    protected static final TagRegistry<Item> collection = TagRegistryManager.create(new ResourceLocation("item"), ITagCollectionSupplier::getItemTags);
    public static final RegistryObject<Item> CARBON  = Registration.ITEMS.register("carbon",()->
            new Item(new Item.Properties().group(ExampleMod.Chemicals)));
    public static final RegistryObject<Item> HYDROGEN  = Registration.ITEMS.register("hydrogen",()->
            new Item(new Item.Properties().group(ExampleMod.Chemicals)));
    public static final RegistryObject<Item> O2 = Registration.ITEMS.register("o2",()->
            new Item(new Item.Properties().group(ExampleMod.Chemicals)));
    public static final RegistryObject<Item>  IRON = Registration.ITEMS.register("iron", ()->
            new Item(new Item.Properties().group(ExampleMod.Chemicals)));
    public static final RegistryObject<Item> NITROGEN  = Registration.ITEMS.register("nitrogen",()->
            new Item(new Item.Properties().group(ExampleMod.Chemicals)));

    public static final RegistryObject<Item> HELIUM = Registration.ITEMS.register("helium",()->
            new Item(new Item.Properties().group(ExampleMod.Chemicals)));
    public static final RegistryObject<Item> LEAD = Registration.ITEMS.register("lead",()->
            new Item(new Item.Properties().group(ExampleMod.Chemicals)));
    public static final RegistryObject<Item> STEEL = Registration.ITEMS.register("steel",()->
            new Item(new Item.Properties().group(ExampleMod.Chemicals)));
    public static final RegistryObject<Item> BUCKET_OF_MOLTEN_IRON = Registration.ITEMS.register("molten_steel",()->
            new Item(new Item.Properties().group(ExampleMod.Chemicals)));
    public static final RegistryObject<SpecialItem> SPECIALITEM = Registration.ITEMS.register("specila_item",()->
            new SpecialItem(new Item.Properties().group(ExampleMod.Chemicals)));
    public static final ITag.INamedTag<Item> RUBY = makeWrapperTag("ruby");

    public static ITag.INamedTag<Item> makeWrapperTag(String id) {
        return collection.createTag(id);
    }
    public static net.minecraftforge.common.Tags.IOptionalNamedTag<Item> createOptional(ResourceLocation name) {
        return createOptional(name, null);
    }

    public static net.minecraftforge.common.Tags.IOptionalNamedTag<Item> createOptional(ResourceLocation name, @javax.annotation.Nullable java.util.Set<java.util.function.Supplier<Item>> defaults) {
        return collection.createOptional(name, defaults);
    }

    public static ITagCollection<Item> getCollection() {
        return collection.getCollection();
    }

    public static List<? extends ITag.INamedTag<Item>> getAllTags() {
        return collection.getTags();
    }




    static void registerItems(){
        
    }
}

[Rudra Mathe]

Can you help me with this i am new to Java .Please tell me how to make tags

[Rudra Mathe]

Please also help me where the error was