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Error when launching

bruhx

By bruhx
in Support & Bug Reports

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bruhx Tree Puncher

bruhx

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[20:45:20] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[20:45:20] [main/INFO]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[20:45:20] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[20:45:21] [main/INFO]: Forge Mod Loader version 14.23.5.2847 for Minecraft 1.12.2 loading
[20:45:21] [main/INFO]: Java is Java HotSpot(TM) Client VM, version 1.8.0_51, running on Windows 10:x86:10.0, installed at C:\Users\robbi\Twitch\Minecraft\Install\runtime\jre-x86
[20:45:22] [main/WARN]: The coremod FMLCorePlugin (net.minecraftforge.fml.relauncher.FMLCorePlugin) is not signed!
[20:45:22] [main/WARN]: The coremod FMLForgePlugin (net.minecraftforge.classloading.FMLForgePlugin) is not signed!
[20:45:22] [main/INFO]: Searching C:\Users\robbi\Twitch\Minecraft\Instances\Compact Skyblock\mods for mods
[20:45:22] [main/INFO]: Searching C:\Users\robbi\Twitch\Minecraft\Instances\Compact Skyblock\mods\1.12.2 for mods
[20:45:22] [main/INFO]: Loading tweaker guichaguri.betterfps.tweaker.BetterFpsTweaker from BetterFps-1.4.8.jar
[20:45:22] [main/WARN]: Found FMLCorePluginContainsFMLMod marker in ChunkAnimator-MC1.12-1.2.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[20:45:22] [main/WARN]: The coremod lumien.chunkanimator.asm.LoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[20:45:22] [main/WARN]: The coremod LoadingPlugin (lumien.chunkanimator.asm.LoadingPlugin) is not signed!
[20:45:22] [main/WARN]: Found FMLCorePluginContainsFMLMod marker in CTM-MC1.12.2-1.0.1.30.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[20:45:22] [main/WARN]: The coremod team.chisel.ctm.client.asm.CTMCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[20:45:22] [main/WARN]: The coremod CTMCorePlugin (team.chisel.ctm.client.asm.CTMCorePlugin) is not signed!
[20:45:22] [main/INFO]: Loading tweaker org.spongepowered.asm.launch.MixinTweaker from DynamicSurroundings-1.12.2-3.6.0.2.jar
[20:45:22] [main/WARN]: Found FMLCorePluginContainsFMLMod marker in foamfix-0.10.10-1.12.2.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[20:45:22] [main/WARN]: The coremod pl.asie.foamfix.coremod.FoamFixCore does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[20:45:22] [main/WARN]: Found FMLCorePluginContainsFMLMod marker in FoamFix-1.12.2-0.9.4-Anarchy.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[20:45:22] [main/WARN]: The coremod pl.asie.foamfix.coremod.FoamFixCore does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[20:45:22] [main/WARN]: Found FMLCorePluginContainsFMLMod marker in Forgelin-1.8.4.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[20:45:22] [main/WARN]: The coremod net.shadowfacts.forgelin.preloader.ForgelinPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[20:45:22] [main/WARN]: The coremod ForgelinPlugin (net.shadowfacts.forgelin.preloader.ForgelinPlugin) is not signed!
[20:45:22] [main/WARN]: Found FMLCorePluginContainsFMLMod marker in MultiMine-1.12.2.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[20:45:22] [main/WARN]: The coremod atomicstryker.multimine.common.fmlmagic.MMFMLCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[20:45:22] [main/WARN]: The coremod MMFMLCorePlugin (atomicstryker.multimine.common.fmlmagic.MMFMLCorePlugin) is not signed!
[20:45:22] [main/INFO]: Loading tweaker optifine.OptiFineForgeTweaker from OptiFine_1.12.2_HD_U_E3.jar
[20:45:22] [main/WARN]: The coremod OTGCorePlugin (com.pg85.otg.forge.asm.excluded.launch.OTGCorePlugin) is not signed!
[20:45:22] [main/INFO]: Loading tweaker org.spongepowered.asm.launch.MixinTweaker from phosphor-1.12.2-0.2.6+build50-universal.jar
[20:45:22] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[20:45:22] [main/INFO]: Loading tweak class name guichaguri.betterfps.tweaker.BetterFpsTweaker
[20:45:22] [main/INFO]: Loading tweak class name org.spongepowered.asm.launch.MixinTweaker
[20:45:23] [main/INFO]: SpongePowered MIXIN Subsystem Version=0.7.11 Source=file:/C:/Users/robbi/Twitch/Minecraft/Instances/Compact%20Skyblock/mods/DynamicSurroundings-1.12.2-3.6.0.2.jar Service=LaunchWrapper Env=CLIENT
[20:45:24] [main/DEBUG]: Instantiating coremod class TransformLoader
[20:45:24] [main/DEBUG]: The coremod org.orecruncher.dsurround.mixins.TransformLoader requested minecraft version 1.12.2 and minecraft is 1.12.2. It will be loaded.
[20:45:24] [main/DEBUG]: Found signing certificates for coremod TransformLoader (org.orecruncher.dsurround.mixins.TransformLoader)
[20:45:24] [main/DEBUG]: Found certificate 7a2128d395ad96ceb9d9030fbd41d035b435753a
[20:45:24] [main/INFO]: Compatibility level set to JAVA_8
[20:45:24] [main/DEBUG]: Enqueued coremod TransformLoader
[20:45:24] [main/DEBUG]: Instantiating coremod class PhosphorFMLLoadingPlugin
[20:45:24] [main/DEBUG]: The coremod me.jellysquid.mods.phosphor.core.PhosphorFMLLoadingPlugin requested minecraft version 1.12.2 and minecraft is 1.12.2. It will be loaded.
[20:45:24] [main/DEBUG]: Found signing certificates for coremod PhosphorFMLLoadingPlugin (me.jellysquid.mods.phosphor.core.PhosphorFMLLoadingPlugin)
[20:45:24] [main/DEBUG]: Found certificate f0387d288626cc2d937daa504e74af570c52a2f1
[20:45:24] [main/DEBUG]: Enqueued coremod PhosphorFMLLoadingPlugin
[20:45:24] [main/INFO]: Loading tweak class name optifine.OptiFineForgeTweaker
[20:45:24] [main/WARN]: Tweak class name org.spongepowered.asm.launch.MixinTweaker has already been visited -- skipping
[20:45:24] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[20:45:24] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[20:45:24] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[20:45:24] [main/INFO]: Calling tweak class optifine.OptiFineForgeTweaker
[20:45:24] [main/INFO]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: acceptOptions
[20:45:24] [main/INFO]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: injectIntoClassLoader
[20:45:24] [main/INFO]: [optifine.OptiFineClassTransformer:dbg:221]: OptiFine ClassTransformer
[20:45:24] [main/INFO]: [optifine.OptiFineClassTransformer:dbg:221]: OptiFine ZIP file: C:\Users\robbi\Twitch\Minecraft\Instances\Compact Skyblock\mods\OptiFine_1.12.2_HD_U_E3.jar
[20:45:24] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:45:24] [main/DEBUG]: Injecting coremod FMLCorePlugin \{net.minecraftforge.fml.relauncher.FMLCorePlugin\} class transformers
[20:45:24] [main/TRACE]: Registering transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer
[20:45:25] [main/TRACE]: Registering transformer net.minecraftforge.fml.common.asm.transformers.EventSubscriptionTransformer
[20:45:25] [main/TRACE]: Registering transformer net.minecraftforge.fml.common.asm.transformers.EventSubscriberTransformer
[20:45:25] [main/TRACE]: Registering transformer net.minecraftforge.fml.common.asm.transformers.SoundEngineFixTransformer
[20:45:25] [main/DEBUG]: Injection complete
[20:45:25] [main/DEBUG]: Running coremod plugin for FMLCorePlugin \{net.minecraftforge.fml.relauncher.FMLCorePlugin\}
[20:45:25] [main/DEBUG]: Running coremod plugin FMLCorePlugin
[20:45:32] [main/INFO]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[20:45:32] [main/ERROR]: FML appears to be missing any signature data. This is not a good thing
[20:45:32] [main/DEBUG]: Coremod plugin class FMLCorePlugin run successfully
[20:45:32] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:45:32] [main/DEBUG]: Injecting coremod FMLForgePlugin \{net.minecraftforge.classloading.FMLForgePlugin\} class transformers
[20:45:32] [main/DEBUG]: Injection complete
[20:45:32] [main/DEBUG]: Running coremod plugin for FMLForgePlugin \{net.minecraftforge.classloading.FMLForgePlugin\}
[20:45:32] [main/DEBUG]: Running coremod plugin FMLForgePlugin
[20:45:32] [main/DEBUG]: Coremod plugin class FMLForgePlugin run successfully
[20:45:32] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:45:32] [main/DEBUG]: Injecting coremod ForgelinPlugin \{net.shadowfacts.forgelin.preloader.ForgelinPlugin\} class transformers
[20:45:32] [main/DEBUG]: Injection complete
[20:45:32] [main/DEBUG]: Running coremod plugin for ForgelinPlugin \{net.shadowfacts.forgelin.preloader.ForgelinPlugin\}
[20:45:32] [main/DEBUG]: Running coremod plugin ForgelinPlugin
[20:45:32] [main/DEBUG]: Coremod plugin class ForgelinPlugin run successfully
[20:45:32] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:45:32] [main/DEBUG]: Injecting coremod MMFMLCorePlugin \{atomicstryker.multimine.common.fmlmagic.MMFMLCorePlugin\} class transformers
[20:45:32] [main/TRACE]: Registering transformer atomicstryker.multimine.common.fmlmagic.MMTransformer
[20:45:32] [main/DEBUG]: Injection complete
[20:45:32] [main/DEBUG]: Running coremod plugin for MMFMLCorePlugin \{atomicstryker.multimine.common.fmlmagic.MMFMLCorePlugin\}
[20:45:32] [main/DEBUG]: Running coremod plugin MMFMLCorePlugin
[20:45:32] [main/DEBUG]: Coremod plugin class MMFMLCorePlugin run successfully
[20:45:32] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:45:32] [main/DEBUG]: Injecting coremod OTGCorePlugin \{com.pg85.otg.forge.asm.excluded.launch.OTGCorePlugin\} class transformers
[20:45:32] [main/TRACE]: Registering transformer com.pg85.otg.forge.asm.excluded.OTGClassTransformer
[20:45:32] [main/DEBUG]: Injection complete
[20:45:32] [main/DEBUG]: Running coremod plugin for OTGCorePlugin \{com.pg85.otg.forge.asm.excluded.launch.OTGCorePlugin\}
[20:45:32] [main/DEBUG]: Running coremod plugin OTGCorePlugin
[20:45:32] [main/DEBUG]: Coremod plugin class OTGCorePlugin run successfully
[20:45:32] [main/INFO]: Calling tweak class org.spongepowered.asm.launch.MixinTweaker
[20:45:32] [main/INFO]: Initialised Mixin FML Remapper Adapter with net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper@bffb8b
[20:45:32] [main/DEBUG]: Injecting coremod TransformLoader \{org.orecruncher.dsurround.mixins.TransformLoader\} class transformers
[20:45:32] [main/DEBUG]: Injection complete
[20:45:32] [main/DEBUG]: Running coremod plugin for TransformLoader \{org.orecruncher.dsurround.mixins.TransformLoader\}
[20:45:32] [main/DEBUG]: Running coremod plugin TransformLoader
[20:45:32] [main/DEBUG]: Coremod plugin class TransformLoader run successfully
[20:45:32] [main/DEBUG]: Injecting coremod PhosphorFMLLoadingPlugin \{me.jellysquid.mods.phosphor.core.PhosphorFMLLoadingPlugin\} class transformers
[20:45:32] [main/DEBUG]: Injection complete
[20:45:32] [main/DEBUG]: Running coremod plugin for PhosphorFMLLoadingPlugin \{me.jellysquid.mods.phosphor.core.PhosphorFMLLoadingPlugin\}
[20:45:32] [main/DEBUG]: Running coremod plugin PhosphorFMLLoadingPlugin
[20:45:32] [main/DEBUG]: Coremod plugin class PhosphorFMLLoadingPlugin run successfully
[20:45:32] [main/INFO]: Calling tweak class guichaguri.betterfps.tweaker.BetterFpsTweaker
[20:45:32] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[20:45:32] [main/DEBUG]: Validating minecraft
[20:45:33] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:45:33] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:45:33] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:45:33] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:45:34] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:45:34] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
[20:45:34] [main/INFO]: Loading tweak class name org.spongepowered.asm.mixin.EnvironmentStateTweaker
[20:45:34] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
[20:45:34] [main/INFO]: Calling tweak class org.spongepowered.asm.mixin.EnvironmentStateTweaker
[20:45:34] [main/INFO]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: getLaunchArguments
[20:45:34] [main/INFO]: [com.pg85.otg.forge.asm.excluded.OTGClassTransformer:transform:77]: OTG-Core transforming: net.minecraft.world.biome.Biome : anh
[20:45:35] [main/INFO]: Patching net.minecraft.client.renderer.EntityRenderer... (buq)
[20:45:35] [main/INFO]: A re-entrant transformer 'guichaguri.betterfps.transformers.PatcherTransformer' was detected and will no longer process meta class data
[20:45:35] [main/INFO]: [com.pg85.otg.forge.asm.excluded.OTGClassTransformer:transform:77]: OTG-Core transforming: net.minecraft.entity.projectile.EntityArrow : aeh
[20:45:36] [main/INFO]: [pl.asie.patchy.helpers.ConstructorReplacingTransformer$FFMethodVisitor:visitTypeInsn:73]: Replaced NEW for net/minecraft/util/ClassInheritanceMultiMap to pl/asie/foamfix/coremod/common/FoamyClassInheritanceMultiMap
[20:45:36] [main/INFO]: [pl.asie.patchy.helpers.ConstructorReplacingTransformer$FFMethodVisitor:visitMethodInsn:85]: Replaced INVOKESPECIAL for net/minecraft/util/ClassInheritanceMultiMap to pl/asie/foamfix/coremod/common/FoamyClassInheritanceMultiMap
[20:45:36] [main/INFO]: A re-entrant transformer '$wrapper.pl.asie.foamfix.coremod.FoamFixTransformer' was detected and will no longer process meta class data
[20:45:36] [main/INFO]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[20:45:36] [main/INFO]: Patching net.minecraft.client.Minecraft... (bib)
[20:45:37] [main/INFO]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:98]: Added INTERFACE: pl/asie/foamfix/coremod/patches/IFoamFixWorldRemovable
[20:45:37] [main/INFO]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:135]: Added METHOD: net.minecraft.world.World.foamfix_removeUnloadedEntities
[20:45:37] [main/INFO]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:98]: Added INTERFACE: pl/asie/foamfix/coremod/patches/IFoamFixWorldRemovable
[20:45:37] [main/INFO]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:111]: Spliced in METHOD: net.minecraft.world.World.foamfix_removeUnloadedEntities
[20:45:37] [main/INFO]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:98]: Added INTERFACE: pl/asie/foamfix/coremod/patches/IFoamFixWorldRemovable
[20:45:37] [main/INFO]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:111]: Spliced in METHOD: net.minecraft.world.World.foamfix_removeUnloadedEntities
[20:45:37] [main/INFO]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:98]: Added INTERFACE: pl/asie/foamfix/coremod/patches/IFoamFixWorldRemovable
[20:45:37] [main/INFO]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:111]: Spliced in METHOD: net.minecraft.world.World.foamfix_removeUnloadedEntities
[20:45:37] [main/ERROR]: Unable to launch
java.lang.reflect.InvocationTargetException: null
    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.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/world/World
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.World
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.ClassFormatError: Duplicate interface name in class file net/minecraft/world/World
    at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_51]
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_51]
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_51]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.Runtime.exit(Runtime.java:107)
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.System.exit(System.java:971)
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

 

I got this. No idea what to do

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bruhx Tree Puncher

bruhx

Posted
  • Author
Posted
3 minutes ago, bruhx said:

[20:45:37] [main/ERROR]: Unable to launch
java.lang.reflect.InvocationTargetException: null
    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.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/world/World
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.World
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.ClassFormatError: Duplicate interface name in class file net/minecraft/world/World
    at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_51]
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_51]
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_51]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.Runtime.exit(Runtime.java:107)
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.System.exit(System.java:971)
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[20:45:37] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

Is where the error seems to be caused.

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