It looks like you are using an unsupported modified version of the game even after reinstallation

[Auxillerian]

Hello, I ran into this error after installing a modpack : The game crashed whilst initializing game
Error: java.lang.NoClassDefFoundError: net/minecraft/client/renderer/RenderItem

The mods I am running are as followed: 

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---- Minecraft Crash Report ----

WARNING: coremods are present:
  MalisisCorePlugin (malisiscore-1.12.2-6.4.0.jar)
  CTMCorePlugin (CTM-MC1.12.2-0.3.2.18.jar)
  NWRTweak (Redstone-Paste-Mod-1.12.1.jar)
Contact their authors BEFORE contacting forge

// You should try our sister game, Minceraft!

Time: 8/16/18 12:05 PM
Description: Initializing game

java.lang.NoClassDefFoundError: net/minecraft/client/renderer/RenderItem
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:504)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:352)
    at net.minecraft.client.main.Main.main(SourceFile:124)
    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.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.renderer.RenderItem
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 9 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
    at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:521)
    at org.spongepowered.asm.mixin.transformer.Proxy.transform(Proxy.java:72)
    at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
    ... 11 more
Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [mixins.malisiscore.core.json:client.MixinMalisisRenderer$MixinRenderItem] from phase [DEFAULT] in config [mixins.malisiscore.core.json] FAILED during APPLY
    at org.spongepowered.asm.mixin.transformer.MixinTransformer.handleMixinError(MixinTransformer.java:779)
    at org.spongepowered.asm.mixin.transformer.MixinTransformer.handleMixinApplyError(MixinTransformer.java:732)
    at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:513)
    ... 14 more
Caused by: org.spongepowered.asm.mixin.injection.throwables.InvalidInjectionException: @Inject annotation on handler$onRenderModel$zzi000 could not find any targets matching 'func_191967_a' in the target class net.minecraft.client.renderer.RenderItem. Using refmap mixins.malisiscore.refmap.json

    ... 14 more

 

can anyone help me out?

Edited August 17, 2018 by diesieben07
removed obnoxious formatting, spoiler.

[Avanyt]

Looks like there is a error with some mod in the modpack