It does not seem to like some of the bug fixes you apply to the game, as disabling that part of the mod lets the game launch smoothly.

java.lang.reflect.InvocationTargetException: null at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_231] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_231] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_231] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_231] 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:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_231] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_231] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_231] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_231] at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196) [NewLaunch.jar:?] at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231) [NewLaunch.jar:?] at org.multimc.EntryPoint.listen(EntryPoint.java:143) [NewLaunch.jar:?] at org.multimc.EntryPoint.main(EntryPoint.java:34) [NewLaunch.jar:?] Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/common/util/FakePlayer at net.minecraft.item.Item.func_150900_l(Item.java:1625) ~[ain.class:?] at net.minecraft.init.Bootstrap.func_151354_b(Bootstrap.java:502) ~[ni.class:?] at net.minecraft.client.Minecraft.<init>(Minecraft.java:365) ~[bib.class:?] at net.minecraft.client.main.Main.main(SourceFile:123) ~[Main.class:?] ... 14 more Caused by: java.lang.ClassNotFoundException: net.minecraftforge.common.util.FakePlayer at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at net.minecraft.item.Item.func_150900_l(Item.java:1625) ~[ain.class:?] at net.minecraft.init.Bootstrap.func_151354_b(Bootstrap.java:502) ~[ni.class:?] at net.minecraft.client.Minecraft.<init>(Minecraft.java:365) ~[bib.class:?] at net.minecraft.client.main.Main.main(SourceFile:123) ~[Main.class:?] ... 14 more Caused by: java.lang.NoClassDefFoundError: net/minecraft/entity/player/EntityPlayerMP at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_231] at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_231] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_231] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at net.minecraft.item.Item.func_150900_l(Item.java:1625) ~[ain.class:?] at net.minecraft.init.Bootstrap.func_151354_b(Bootstrap.java:502) ~[ni.class:?] at net.minecraft.client.Minecraft.<init>(Minecraft.java:365) ~[bib.class:?] at net.minecraft.client.main.Main.main(SourceFile:123) ~[Main.class:?] ... 14 more Caused by: java.lang.ClassNotFoundException: net.minecraft.entity.player.EntityPlayerMP at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_231] at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_231] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_231] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at net.minecraft.item.Item.func_150900_l(Item.java:1625) ~[ain.class:?] at net.minecraft.init.Bootstrap.func_151354_b(Bootstrap.java:502) ~[ni.class:?] at net.minecraft.client.Minecraft.<init>(Minecraft.java:365) ~[bib.class:?] at net.minecraft.client.main.Main.main(SourceFile:123) ~[Main.class:?] ... 14 more Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:364) ~[arcanearchives-0.2.0.17.jar:?] at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:191) ~[arcanearchives-0.2.0.17.jar:?] at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:178) ~[arcanearchives-0.2.0.17.jar:?] at org.spongepowered.asm.mixin.transformer.Proxy.transform(Proxy.java:72) ~[arcanearchives-0.2.0.17.jar:?] at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_231] at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_231] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_231] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231] at net.minecraft.item.Item.func_150900_l(Item.java:1625) ~[ain.class:?] at net.minecraft.init.Bootstrap.func_151354_b(Bootstrap.java:502) ~[ni.class:?] at net.minecraft.client.Minecraft.<init>(Minecraft.java:365) ~[bib.class:?] at net.minecraft.client.main.Main.main(SourceFile:123) ~[Main.class:?]