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Client crash

Dreandor

By Dreandor
in Support & Bug Reports

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Dreandor Tree Puncher

Dreandor

Posted
Posted

Hey,

yesterday I installed Extreme Reactors Mod with zerocore. But now my client crash everytime.

  

---- Minecraft Crash Report ----
// Why did you do that?

Time: 2019-01-16 19:29:04 CET
Description: Initializing game

java.lang.NoClassDefFoundError: cpw/mods/fml/common/IWorldGenerator
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at net.minecraftforge.fml.common.FMLModContainer.constructMod(FMLModContainer.java:526)
    at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
    at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
    at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
    at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
    at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
    at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
    at com.google.common.eventbus.EventBus.post(EventBus.java:217)
    at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:218)
    at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:196)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
    at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
    at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
    at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
    at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
    at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
    at com.google.common.eventbus.EventBus.post(EventBus.java:217)
    at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:135)
    at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:593)
    at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:232)
    at net.minecraft.client.Minecraft.init(Minecraft.java:466)
    at net.minecraft.client.Minecraft.run(Minecraft.java:3930)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.common.IWorldGenerator
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 38 more
Caused by: java.lang.NullPointerException


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

-- System Details --
  Minecraft Version: 1.12.2
  Operating System: Windows 10 (amd64) version 10.0
  Java Version: 1.8.0_191, Oracle Corporation
  Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
  Memory: 3600769000 bytes (3433 MB) / 4294967296 bytes (4096 MB) up to 4294967296 bytes (4096 MB)
  JVM Flags: 5 total; -Xms4096m -Xmx4096m -XX:+UseG1GC -XX:MaxGCPauseMillis=4 -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
  IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
  FML: MCP 9.42 Powered by Forge 14.23.5.2768 Optifine OptiFine_1.12.2_HD_U_E3 88 mods loaded, 88 mods active
       States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
       
       | State | ID                                | Version                  | Source                                             | Signature                                |
       |:----- |:--------------------------------- |:------------------------ |:-------------------------------------------------- |:---------------------------------------- |
       | UC    | minecraft                         | 1.12.2                   | minecraft.jar                                      | None                                     |
       | UC    | mcp                               | 9.42                     | minecraft.jar                                      | None                                     |
       | UC    | FML                               | 8.0.99.99                | modpack.jar                                        | e3c3d50c7c986df74c645c0ac54639741c90a557 |
       | UC    | forge                             | 14.23.5.2768             | modpack.jar                                        | e3c3d50c7c986df74c645c0ac54639741c90a557 |
       | UC    | openmodscore                      | 0.12.1                   | minecraft.jar                                      | None                                     |
       | UC    | foamfixcore                       | 7.7.4                    | minecraft.jar                                      | None                                     |
       | UC    | buildcraftlib                     | 7.99.19                  | buildcraft-7.99.19.jar                             | None                                     |
       | UC    | buildcraftcore                    | 7.99.19                  | buildcraft-7.99.19.jar                             | None                                     |
       | UC    | buildcraftfactory                 | 7.99.19                  | buildcraft-7.99.19.jar                             | None                                     |
       | UC    | buildcrafttransport               | 7.99.19                  | buildcraft-7.99.19.jar                             | None                                     |
       | UC    | buildcraftsilicon                 | 7.99.19                  | buildcraft-7.99.19.jar                             | None                                     |
       | UC    | additionalpipes                   | 6.0.0.8                  | additionalpipes-6.0.0.8.jar                        | None                                     |
       | UC    | ic2                               | 2.8.74-ex112             | industrialcraft-2-2.8.74-ex112.jar                 | de041f9f6187debbc77034a344134053277aa3b0 |
       | UC    | advanced_solar_panels             | 4.3.0                    | Advanced+Solar+Panels-4.3.0.jar                    | None                                     |
       | UC    | ctm                               | MC1.12.2-0.3.3.22        | CTM-MC1.12.2-0.3.3.22.jar                          | None                                     |
       | UC    | appliedenergistics2               | rv6-stable-6             | appliedenergistics2-rv6-stable-6.jar               | dfa4d3ac143316c6f32aa1a1beda1e34d42132e5 |
       | UC    | bdlib                             | 1.14.3.12                | bdlib-1.14.3.12-mc1.12.2.jar                       | None                                     |
       | UC    | ae2stuff                          | 0.7.0.4                  | ae2stuff-0.7.0.4-mc1.12.2.jar                      | None                                     |
       | UC    | baubles                           | 1.5.2                    | Baubles-1.12-1.5.2.jar                             | None                                     |
       | UC    | bibliocraft                       | 2.4.5                    | BiblioCraft[v2.4.5][MC1.12.2].jar                  | None                                     |
       | UC    | biomesoplenty                     | 7.0.1.2419               | BiomesOPlenty-1.12.2-7.0.1.2419-universal.jar      | None                                     |
       | UC    | guideapi                          | 1.12-2.1.8-63            | Guide-API-1.12-2.1.8-63.jar                        | None                                     |
       | UC    | bloodmagic                        | 1.12.2-2.3.3-101         | BloodMagic-1.12.2-2.3.3-101.jar                    | None                                     |
       | UC    | bookshelf                         | 2.3.569                  | Bookshelf-1.12.2-2.3.569.jar                       | d476d1b22b218a10d845928d1665d45fce301b27 |
       | UC    | jei                               | 4.13.1.225               | jei_1.12.2-4.13.1.225.jar                          | None                                     |
       | UC    | botania                           | r1.10-358                | Botania+r1.10-358.jar                              | None                                     |
       | UC    | codechickenlib                    | 3.2.2.353                | CodeChickenLib-1.12.2-3.2.2.353-universal.jar      | f1850c39b2516232a2108a7bd84d1cb5df93b261 |
       | UC    | redstoneflux                      | 2.1.0                    | RedstoneFlux-1.12-2.1.0.6-universal.jar            | 8a6abf2cb9e141b866580d369ba6548732eff25f |
       | UC    | brandonscore                      | 2.4.9                    | BrandonsCore-1.12.2-2.4.9.195-universal.jar        | None                                     |
       | UC    | buildcraftbuilders                | 7.99.19                  | buildcraft-7.99.19.jar                             | None                                     |
       | UC    | buildcraftenergy                  | 7.99.19                  | buildcraft-7.99.19.jar                             | None                                     |
       | UC    | buildcraftrobotics                | 7.99.19                  | buildcraft-7.99.19.jar                             | None                                     |
       | UC    | carpentersblocks                  | 3.4.0-poc.5              | Carpenter's Blocks v3.4.0-poc.5 - MC 1.12.2.jar    | None                                     |
       | UC    | chisel                            | MC1.12.2-0.2.1.35        | Chisel-MC1.12.2-0.2.1.35.jar                       | None                                     |
       | UC    | cofhcore                          | 4.6.1                    | CoFHCore-1.12.2-4.6.1.22-universal.jar             | None                                     |
       | UC    | cofhworld                         | 1.3.0                    | CoFHWorld-1.12.2-1.3.0.6-universal.jar             | 8a6abf2cb9e141b866580d369ba6548732eff25f |
       | UC    | ptrmodellib                       | 1.0.3                    | PTRLib-1.0.3.jar                                   | None                                     |
       | UC    | props                             | 2.6.2                    | Decocraft-2.6.2_1.12.2.jar                         | None                                     |
       | UC    | thermalfoundation                 | 2.6.1                    | ThermalFoundation-1.12.2-2.6.1.22-universal.jar    | 8a6abf2cb9e141b866580d369ba6548732eff25f |
       | UC    | draconicevolution                 | 2.3.18                   | Draconic-Evolution-1.12.2-2.3.18.329-universal.jar | None                                     |
       | UC    | eplus                             | 5.0.174                  | EnchantingPlus-1.12.2-5.0.174.jar                  | d476d1b22b218a10d845928d1665d45fce301b27 |
       | UC    | endercore                         | 1.12.2-0.5.43            | EnderCore-1.12.2-0.5.43.jar                        | None                                     |
       | UC    | thermalexpansion                  | 5.5.2                    | ThermalExpansion-1.12.2-5.5.2.39-universal.jar     | 8a6abf2cb9e141b866580d369ba6548732eff25f |
       | UC    | enderio                           | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | enderiointegrationtic             | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | enderiobase                       | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | enderioconduits                   | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | enderioconduitsappliedenergistics | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | enderioconduitsopencomputers      | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | enderioconduitsrefinedstorage     | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | forestry                          | 5.8.1.322                | forestry_1.12.2-5.8.1.322.jar                      | None                                     |
       | UC    | enderiointegrationforestry        | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | mantle                            | 1.12-1.3.3.39            | Mantle-1.12-1.3.3.39.jar                           | None                                     |
       | UC    | twilightforest                    | 3.8.689                  | twilightforest-1.12.2-3.8.689-universal.jar        | None                                     |
       | UC    | tconstruct                        | 1.12.2-2.12.0.113        | TConstruct-1.12.2-2.12.0.113.jar                   | None                                     |
       | UC    | enderiointegrationticlate         | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | enderiomachines                   | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | enderiopowertools                 | 5.0.39                   | EnderIO-1.12.2-5.0.39.jar                          | None                                     |
       | UC    | enderstorage                      | 2.4.5.135                | EnderStorage-1.12.2-2.4.5.135-universal.jar        | f1850c39b2516232a2108a7bd84d1cb5df93b261 |
       | UC    | energyconverters                  | 1.0.1.2                  | energyconverters_1.12.1-1.0.1.2.jar                | None                                     |
       | UC    | zerocore                          | 1.12-0.1.2.3             | zerocore-1.12-0.1.2.3.jar                          | None                                     |
       | U     | bigreactors                       | 1.12.2-0.4.5.50          | ExtremeReactors-1.12.2-0.4.5.50.jar                | None                                     |
       | U     | foamfix                           | 0.10.3-1.12.2            | foamfix-0.10.3-1.12.2.jar                          | None                                     |
       | U     | cfm                               | 6.2.0                    | furniture-6.2.0-1.12.2.jar                         | None                                     |
       | U     | geneticsreborn                    | 1.09                     | geneticsreborn-1.12-1.09.jar                       | None                                     |
       | U     | gravestone                        | 1.10.1                   | gravestone-1.10.1.jar                              | None                                     |
       | U     | waila                             | 1.8.26                   | Hwyla-1.8.26-B41_1.12.2.jar                        | None                                     |
       | U     | ichunutil                         | 7.1.4                    | iChunUtil-1.12.2-7.1.4.jar                         | None                                     |
       | U     | inventorytweaks                   | 1.63+release.109.220f184 | InventoryTweaks-1.63.jar                           | None                                     |
       | U     | ironchest                         | 1.12.2-7.0.54.838        | ironchest-1.12.2-7.0.54.838.jar                    | None                                     |
       | U     | journeymap                        | 1.12.2-5.5.3             | journeymap-1.12.2-5.5.3.jar                        | None                                     |
       | U     | lex                               | 1.0.8                    | LibEx-1.12.2-1.0.8.jar                             | None                                     |
       | U     | mcjtylib_ng                       | 3.0.7                    | mcjtylib-1.12-3.0.7.jar                            | None                                     |
       | U     | morpheus                          | 1.12-3.3.2               | Morpheus-1.12-3.3.2.jar                            | None                                     |
       | U     | nex                               | 2.0.8                    | NetherEx-1.12.2-2.0.8.jar                          | None                                     |
       | U     | recipehandler                     | 0.12                     | NoMoreRecipeConflict-0.12(1.12.2).jar              | None                                     |
       | U     | openmods                          | 0.12.1                   | OpenModsLib-1.12.2-0.12.1.jar                      | None                                     |
       | U     | openblocks                        | 1.8                      | OpenBlocks-1.12.2-1.8.jar                          | None                                     |
       | U     | portalgun                         | 7.0.2                    | PortalGun-1.12.2-7.0.2.jar                         | None                                     |
       | U     | rftools                           | 7.59                     | rftools-1.12-7.59.jar                              | None                                     |
       | U     | rftoolsdim                        | 5.63                     | rftoolsdim-1.12-5.63.jar                           | None                                     |
       | U     | solarflux                         | 4.32r                    | SolarFluxReborn_1.12.2-4.32r.jar                   | None                                     |
       | U     | texfix                            | 4.0                      | TexFix+V-1.12-4.0.jar                              | None                                     |
       | U     | thermaldynamics                   | 2.5.3                    | ThermalDynamics-1.12.2-2.5.3.16-universal.jar      | None                                     |
       | U     | bspkrscore                        | at_0.9                   | Treecapitator-1.12-at_0.9a.jar                     | None                                     |
       | U     | treecapitator                     | at_0.9                   | Treecapitator-1.12-at_0.9a.jar                     | None                                     |
       | U     | vanillafix                        | 1.0.10-SNAPSHOT          | VanillaFix-1.0.10-99.jar                           | None                                     |
       | U     | immersiveengineering              | 0.12-88                  | ImmersiveEngineering-0.12-88.jar                   | None                                     |
  Loaded coremods (and transformers): Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
                                        invtweaks.forge.asm.ContainerTransformer
                                      EnderCorePlugin (EnderCore-1.12.2-0.5.43.jar)
                                        com.enderio.core.common.transform.EnderCoreTransformer
                                        com.enderio.core.common.transform.SimpleMixinPatcher
                                      VanillaFixLoadingPlugin (VanillaFix-1.0.10-99.jar)
                                        
                                      Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.3-1.12.2.jar)
                                        pl.asie.foamfix.coremod.FoamFixTransformer
                                      IELoadingPlugin (ImmersiveEngineering-core-0.12-88.jar)
                                        blusunrize.immersiveengineering.common.asm.IEClassTransformer
                                      OpenModsCorePlugin (OpenModsLib-1.12.2-0.12.1.jar)
                                        openmods.core.OpenModsClassTransformer
                                      CTMCorePlugin (CTM-MC1.12.2-0.3.3.22.jar)
                                        team.chisel.ctm.client.asm.CTMTransformer
  GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 417.35' Renderer: 'GeForce GTX 1050/PCIe/SSE2'
  OpenModsLib class transformers: [llama_null_fix:FINISHED],[horse_base_null_fix:FINISHED],[pre_world_render_hook:FINISHED],[player_render_hook:FINISHED],[horse_null_fix:FINISHED]
  AE2 Version: stable rv6-stable-6 for Forge 14.23.5.2768
  Pulsar/tconstruct loaded Pulses: - TinkerCommons (Enabled/Forced)
                                   - TinkerWorld (Enabled/Not Forced)
                                   - TinkerTools (Enabled/Not Forced)
                                   - TinkerHarvestTools (Enabled/Forced)
                                   - TinkerMeleeWeapons (Enabled/Forced)
                                   - TinkerRangedWeapons (Enabled/Forced)
                                   - TinkerModifiers (Enabled/Forced)
                                   - TinkerSmeltery (Enabled/Not Forced)
                                   - TinkerGadgets (Enabled/Not Forced)
                                   - TinkerOredict (Enabled/Forced)
                                   - TinkerIntegration (Enabled/Forced)
                                   - TinkerFluids (Enabled/Forced)
                                   - TinkerMaterials (Enabled/Forced)
                                   - TinkerModelRegister (Enabled/Forced)
                                   - chiselIntegration (Enabled/Not Forced)
                                   - wailaIntegration (Enabled/Not Forced)
  Suspected Mods: Unknown
  Launched Version: 1.12.2-forge1.12.2-14.23.5.2768
  LWJGL: 2.9.4
  OpenGL: GeForce GTX 1050/PCIe/SSE2 GL version 4.6.0 NVIDIA 417.35, NVIDIA Corporation
  GL Caps: Using GL 1.3 multitexturing.
           Using GL 1.3 texture combiners.
           Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
           Shaders are available because OpenGL 2.1 is supported.
           VBOs are available because OpenGL 1.5 is supported.
  Using VBOs: Yes
  Is Modded: Definitely; Client brand changed to 'fml,forge'
  Type: Client (map_client.txt)
  Resource Packs: 
  Current Language: English (US)
  Profiler Position: N/A (disabled)
  CPU: 4x Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz

 

Legenes Creeper Killer

Legenes

Posted
Posted

Your Core mod maybe outdated or too new to the extremeReactor's version, I think. It looks like a class in the core mod is moved / changed, and extreme reactors can't find it:

13 minutes ago, Dreandor said:

NoClassDefFoundError: cpw/mods/fml/common/IWorldGenerator

  

procedure WakeMeUp(Integer plusTime);
var
  I: Integer;
begin
  for I := 0 to plusTime do begin
    println('One more minute!');
    Sleep(1000);
  end;
  println('Okay, nothing to worry, I''m alive!');
  println('So... somebody can give me a coffee?');
  println('I know it''s Pascal, and not Java, but I love it :D.');
end;
Cadiboo Reality Controller

Cadiboo

Posted
Posted

You're appear to be trying to load a mod made for <1.7.10 (or at least with references to 1.7.10 classes) on 1.12.2

About Me

Spoiler

My Discord - Cadiboo#8887

My Website - Cadiboo.github.io

My Mods - Cadiboo.github.io/projects

My Tutorials - Cadiboo.github.io/tutorials

Versions below 1.14.4 are no longer supported on this forum. Use the latest version to receive support.

When asking support remember to include all relevant log files (logs are found in .minecraft/logs/), code if applicable and screenshots if possible.

Only download mods from trusted sites like CurseForge (minecraft.curseforge.com). A list of bad sites can be found here, with more information available at stopmodreposts.org

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      Help needed with forge modded server

      By Aeithalis · Posted

      Hello there! I didn't quite know where to go regarding this, but ended up deciding to post it here. I have been running a forge server with around 200 mods for me and some friends to play on casually, but have recently started to get an issue when booting the server. This all started after I decided to add some new mods to the server. Like usual, I add a mod, test run the server for any issues, and if all is well, I'll add a next one and so on until I have added all that I wanted to. After doing so, in all test runs, it all seemed to work just fine. However, the next day, after trying to boot the server, I kept getting an error regarding java.lang.NullPointerException, towards one of the mods I had recently added. So far so good, I removed the mod that was causing the issue, started up the server again, and here in when things took a turn for the worse. I received another java.lang.NullPointerException null error that wouldn't allow me to boot the server, but this time with a mod that wasn't part of the new ones I had recently added. I found this weird, but nonetheless, I removed it thinking it might be causing some conflicts with some of the new ones. Afterwards, booting the server again proved to be impossible, as it gave me another java.lang.NullPointerException null error with the 3rd mod I had ever installed on the server! This mod was there since the start, it added some biomes and had been just fine so far. This turn of events made me remove all the newer mods I had recently added in hopes to fix this whole ordeal, but alas, to no avail. Same error, with that same biome mod that had been there since day one. Reluctantly, I removed the biome mod, booted the server, and voila! The server was running, although without a major mod that had always been there to begin with. As I do not wish to part ways with this mod, specially since it had been working so far without any issues, I tried to bring everything back to how it was before I added those new mods, but kept on getting the same java.lang.NullPointerException null error for the biome mod. Even adding the newer mods won't cause me this error, with exception of the one that started it all, which I find quite odd since the mods I had been using without any issues are now giving me the same error the newer one that started it all gave me. Now, I have checked that everything is up to date regarding the mods, forge (forge-1.20.1-47.3.12) and java. The modpack runs perfectly fine when I start Minecraft itself, and play singleplayer, or even when I open a LAN world, everything works. Everything aside from the server. From what I could gather, this java.lang.NullPointerException null error would point to a missing value of sorts, for an item perhaps, within the mod that is causing the error, but aside from removing the whole mod, I lack the knowledge on how to fix this. With this in mind, if anyone would be so kind as to shine some light into this situation, with a way to fix all this blunder, I would be most grateful!
    • Xoroshio
      1.21 Displaying a Mana Bar

      By Xoroshio · Posted

      If you want a mana GUI, call Minecraft.getInstance().setScreen(new ManaScreen()); somewhere display your GUI. I would recommend creating a keybind and listening to key events, and if your key bind is pressed down, running that code.
    • Xoroshio
      1.21 Displaying a Mana Bar

      By Xoroshio · Posted

      You are creating an entire new screen, or GUI. What you probably want is an Overlay.

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