[error] java.lang.NullPointerException: Unexpected error

[saturn_tea]

Crashes every time I try to enter a world. I think it's something to do with forge and optifine compatibility but I don't know exactly what.

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 3/27/21 10:47 PM
Description: Starting integrated server

java.lang.NoSuchMethodError: net.minecraft.util.ResourceLocation.compareNamespaced(Lnet/minecraft/util/ResourceLocation;)I
    at net.minecraftforge.registries.ForgeRegistry$Snapshot.lambda$static$0(ForgeRegistry.java:844)
    at net.minecraftforge.registries.ForgeRegistry$Snapshot$$Lambda$5662/156954340.compare(Unknown Source)
    at java.util.TreeMap.compare(TreeMap.java:1291)
    at java.util.TreeMap.put(TreeMap.java:538)
    at net.minecraftforge.registries.ForgeRegistry.lambda$makeSnapshot$3(ForgeRegistry.java:820)
    at net.minecraftforge.registries.ForgeRegistry$$Lambda$5663/1008561904.accept(Unknown Source)
    at com.google.common.collect.HashBiMap.forEach(HashBiMap.java:528)
    at net.minecraftforge.registries.ForgeRegistry.makeSnapshot(ForgeRegistry.java:820)
    at net.minecraftforge.registries.RegistryManager.lambda$takeSnapshot$2(RegistryManager.java:180)
    at net.minecraftforge.registries.RegistryManager$$Lambda$5661/1486504709.accept(Unknown Source)
    at java.lang.Iterable.forEach(Iterable.java:75)
    at net.minecraftforge.registries.RegistryManager.takeSnapshot(RegistryManager.java:180)
    at net.minecraftforge.fml.FMLWorldPersistenceHook.getDataForWriting(FMLWorldPersistenceHook.java:76)
    at net.minecraftforge.fml.WorldPersistenceHooks.lambda$handleWorldDataSave$0(WorldPersistenceHooks.java:40)
    at net.minecraftforge.fml.WorldPersistenceHooks$$Lambda$5659/1901525199.accept(Unknown Source)
    at java.util.ArrayList.forEach(ArrayList.java:1249)
    at net.minecraftforge.fml.WorldPersistenceHooks.handleWorldDataSave(WorldPersistenceHooks.java:40)
    at net.minecraft.world.storage.SaveFormat$LevelSave.func_237288_a_(SaveFormat.java:345)
    at net.minecraft.world.storage.SaveFormat$LevelSave.func_237287_a_(SaveFormat.java:336)
    at net.minecraft.client.Minecraft.loadWorld(Minecraft.java:1740)
    at net.minecraft.client.Minecraft.func_238192_a_(Minecraft.java:1685)
    at net.minecraft.client.gui.screen.CreateWorldScreen.func_195352_j(CreateWorldScreen.java:260)
    at net.minecraft.client.gui.screen.CreateWorldScreen.lambda$init$11(CreateWorldScreen.java:205)
    at net.minecraft.client.gui.screen.CreateWorldScreen$$Lambda$4863/1098645181.onPress(Unknown Source)
    at net.minecraft.client.gui.widget.button.Button.func_230930_b_(SourceFile:33)
    at net.minecraft.client.gui.widget.button.AbstractButton.func_230982_a_(SourceFile:16)
    at net.minecraft.client.gui.widget.Widget.func_231044_a_(Widget.java:136)
    at net.minecraft.client.gui.INestedGuiEventHandler.func_231044_a_(SourceFile:27)
    at net.minecraft.client.MouseHelper.func_198033_b(MouseHelper.java:87)
    at net.minecraft.client.MouseHelper$$Lambda$4494/642340409.run(Unknown Source)
    at net.minecraft.client.gui.screen.Screen.func_231153_a_(Screen.java:427)
    at net.minecraft.client.MouseHelper.func_198023_a(MouseHelper.java:85)
    at net.minecraft.client.MouseHelper.func_228030_c_(MouseHelper.java:175)
    at net.minecraft.client.MouseHelper$$Lambda$4493/2050640357.run(Unknown Source)
    at net.minecraft.util.concurrent.ThreadTaskExecutor.execute(SourceFile:94)
    at net.minecraft.client.MouseHelper.func_228028_b_(MouseHelper.java:174)
    at net.minecraft.client.MouseHelper$$Lambda$3918/900416096.invoke(Unknown Source)
    at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36)
    at org.lwjgl.system.JNI.invokeV(Native Method)
    at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174)
    at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127)
    at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:999)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607)
    at net.minecraft.client.main.Main.main(Main.java:184)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51)
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$446/1955587357.call(Unknown Source)
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:82)
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)

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

-- Head --
Thread: Render thread
Stacktrace:
    at net.minecraftforge.registries.ForgeRegistry$Snapshot.lambda$static$0(ForgeRegistry.java:844)
    at net.minecraftforge.registries.ForgeRegistry$Snapshot$$Lambda$5662/156954340.compare(Unknown Source)
    at java.util.TreeMap.compare(TreeMap.java:1291)
    at java.util.TreeMap.put(TreeMap.java:538)
    at net.minecraftforge.registries.ForgeRegistry.lambda$makeSnapshot$3(ForgeRegistry.java:820)
    at net.minecraftforge.registries.ForgeRegistry$$Lambda$5663/1008561904.accept(Unknown Source)
    at com.google.common.collect.HashBiMap.forEach(HashBiMap.java:528)
    at net.minecraftforge.registries.ForgeRegistry.makeSnapshot(ForgeRegistry.java:820)
    at net.minecraftforge.registries.RegistryManager.lambda$takeSnapshot$2(RegistryManager.java:180)
    at net.minecraftforge.registries.RegistryManager$$Lambda$5661/1486504709.accept(Unknown Source)
    at java.lang.Iterable.forEach(Iterable.java:75)
    at net.minecraftforge.registries.RegistryManager.takeSnapshot(RegistryManager.java:180)
    at net.minecraftforge.fml.FMLWorldPersistenceHook.getDataForWriting(FMLWorldPersistenceHook.java:76)
    at net.minecraftforge.fml.WorldPersistenceHooks.lambda$handleWorldDataSave$0(WorldPersistenceHooks.java:40)
    at net.minecraftforge.fml.WorldPersistenceHooks$$Lambda$5659/1901525199.accept(Unknown Source)
    at java.util.ArrayList.forEach(ArrayList.java:1249)
    at net.minecraftforge.fml.WorldPersistenceHooks.handleWorldDataSave(WorldPersistenceHooks.java:40)
    at net.minecraft.world.storage.SaveFormat$LevelSave.func_237288_a_(SaveFormat.java:345)
    at net.minecraft.world.storage.SaveFormat$LevelSave.func_237287_a_(SaveFormat.java:336)

-- Starting integrated server --
Details:
    Level ID: New World (5)
    Level Name: New World
Stacktrace:
    at net.minecraft.client.Minecraft.loadWorld(Minecraft.java:1740) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_238192_a_(Minecraft.java:1685) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.CreateWorldScreen.func_195352_j(CreateWorldScreen.java:260) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.CreateWorldScreen.lambda$init$11(CreateWorldScreen.java:205) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.CreateWorldScreen$$Lambda$4863/1098645181.onPress(Unknown Source) ~[?:?] {}
    at net.minecraft.client.gui.widget.button.Button.func_230930_b_(SourceFile:33) ~[?:?] {re:classloading}
    at net.minecraft.client.gui.widget.button.AbstractButton.func_230982_a_(SourceFile:16) ~[?:?] {re:classloading}
    at net.minecraft.client.gui.widget.Widget.func_231044_a_(Widget.java:136) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.INestedGuiEventHandler.func_231044_a_(SourceFile:27) ~[?:?] {re:classloading}
    at net.minecraft.client.MouseHelper.func_198033_b(MouseHelper.java:87) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper$$Lambda$4494/642340409.run(Unknown Source) ~[?:?] {}

-- Affected screen --
Details:
    Screen name: net.minecraft.client.gui.screen.CreateWorldScreen
Stacktrace:
    at net.minecraft.client.gui.screen.Screen.func_231153_a_(Screen.java:427) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper.func_198023_a(MouseHelper.java:85) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper.func_228030_c_(MouseHelper.java:175) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper$$Lambda$4493/2050640357.run(Unknown Source) ~[?:?] {}
    at net.minecraft.util.concurrent.ThreadTaskExecutor.execute(SourceFile:94) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:OptiFine:default}
    at net.minecraft.client.MouseHelper.func_228028_b_(MouseHelper.java:174) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper$$Lambda$3918/900416096.invoke(Unknown Source) ~[?:?] {}
    at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) ~[lwjgl-glfw-3.2.2.jar:build 10] {}
    at org.lwjgl.system.JNI.invokeV(Native Method) ~[lwjgl-3.2.2.jar:build 10] {}
    at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174) ~[lwjgl-glfw-3.2.2.jar:build 10] {}
    at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127) ~[?:?] {re:classloading}
    at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:999) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(Main.java:184) [?:?] {re:classloading,pl:runtimedistcleaner:A}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) [forge-1.16.5-36.1.0.jar:36.1] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$446/1955587357.call(Unknown Source) [forge-1.16.5-36.1.0.jar:36.1] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.9.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.9.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.9.jar:?] {}

-- System Details --
Details:
    Minecraft Version: 1.16.5
    Minecraft Version ID: 1.16.5
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 926283016 bytes (883 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
    CPUs: 12
    JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
    ModLauncher: 8.0.9+86+master.3cf110c
    ModLauncher launch target: fmlclient
    ModLauncher naming: srg
    ModLauncher services: 
        /mixin-0.8.2.jar mixin PLUGINSERVICE 
        /eventbus-4.0.0.jar eventbus PLUGINSERVICE 
        /forge-1.16.5-36.1.0.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.16.5-36.1.0.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-3.0.1.jar accesstransformer PLUGINSERVICE 
        /forge-1.16.5-36.1.0.jar capability_inject_definalize PLUGINSERVICE 
        /forge-1.16.5-36.1.0.jar runtimedistcleaner PLUGINSERVICE 
        /mixin-0.8.2.jar mixin TRANSFORMATIONSERVICE 
        /OptiFine_1.16.2_HD_U_G4.jar OptiFine TRANSFORMATIONSERVICE 
        /forge-1.16.5-36.1.0.jar fml TRANSFORMATIONSERVICE 
    FML: 36.1
    Forge: net.minecraftforge:36.1.0
    FML Language Providers: 
        [email protected]
        minecraft@1
    Mod List: 
        forge-1.16.5-36.1.0-client.jar                    |Minecraft                     |minecraft                     |1.16.5              |DONE      |NOSIGNATURE
        forge-1.16.5-36.1.0-universal.jar                 |Forge                         |forge                         |36.1.0              |DONE      |22:af:21:d8:19:82:7f:93:94:fe:2b:ac:b7:e4:41:57:68:39:87:b1:a7:5c:c6:44:f9:25:74:21:14:f5:0d:90
        mermaidtail-1.4.jar                               |Mermaid Tail Mod              |mermaidtail                   |1.16.4-1.4.0        |DONE      |NOSIGNATURE
        citadel-1.6.2.jar                                 |Citadel                       |citadel                       |1.6.2               |DONE      |NOSIGNATURE
        iceandfire-2.1.6-1.16.4.jar                       |Ice and Fire                  |iceandfire                    |2.1.6-1.16.4        |DONE      |NOSIGNATURE
        TravelersBackpack-1.16.4-5.3.8.jar                |Traveler's Backpack           |travelersbackpack             |5.3.8               |DONE      |NOSIGNATURE
    Crash Report UUID: 2c224fc6-ca3a-4044-97d0-bd94ded612e6
    Launched Version: 1.16.5-forge-36.1.0
    Backend library: LWJGL version 3.2.2 build 10
    Backend API: GeForce RTX 2060/PCIe/SSE2 GL version 4.6.0 NVIDIA 461.72, NVIDIA Corporation
    GL Caps: Using framebuffer using OpenGL 3.0
    Using VBOs: Yes
    Is Modded: Definitely; Client brand changed to 'forge'
    Type: Client (map_client.txt)
    Graphics mode: fancy
    Resource Packs: vanilla, file/Livelihood (V. 0.3).zip, file/Space_Hotbar.zip, file/assorteddogbreeds.zip, file/oak-fox-variants.zip
    Current Language: English (US)
    CPU: 12x Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz
    OptiFine Version: OptiFine_1.16.2_HD_U_G3_pre2
    OptiFine Build: 20200820-215433
    Shaders: null
    OpenGlVersion: null
    OpenGlRenderer: null
    OpenGlVendor: null
    CpuCount: 0

[DoatZzed]

@diesieben07 I get the same error code and deleting optifine did not work what should I do