It appears it's conflicting with Icarus (on fabric 1.20.1) and crashed while initializing the game.
java.lang.RuntimeException: Mixin transformation of net.minecraft.client.Mouse failed
at app//net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:427)
at app//net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323)
at app//net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218)
at app//net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112)
at java.base@18.0.2.1/java.lang.ClassLoader.loadClass(Unknown Source)
at MC//net.minecraft.client.MinecraftClient.<init>(MinecraftClient.java:499)
at net.minecraft.client.main.Main.main(Main.java:211)
at app//net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468)
at app//net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at app//net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
at app//org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:392)
at app//org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234)
at app//org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202)
at app//net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422)
... 9 more
Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [icarus.mixins.json:client.MouseMixin from mod icarus] from phase [DEFAULT] in config [icarus.mixins.json] FAILED during APPLY
at app//org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinError(MixinProcessor.java:638)
at app//org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinApplyError(MixinProcessor.java:589)
at app//org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:379)
... 12 more
Caused by: org.spongepowered.asm.mixin.injection.throwables.InvalidInjectionException: Specified index 0 for @ModifyArg is invalid for args (Lnet/minecraft/client/network/ClientPlayerEntity;DD), expected D on net/minecraft/client/Mouse::changeLookDirectionX [INJECT Applicator Phase -> icarus.mixins.json:client.MouseMixin from mod icarus -> Apply Injections -> -> Inject -> icarus.mixins.json:client.MouseMixin from mod icarus->@ModifyArg::changeLookDirectionX(D)D]
at app//org.spongepowered.asm.mixin.injection.invoke.ModifyArgInjector.findArgIndex(ModifyArgInjector.java:158)
at app//org.spongepowered.asm.mixin.injection.invoke.ModifyArgInjector.injectAtInvoke(ModifyArgInjector.java:113)
at app//org.spongepowered.asm.mixin.injection.invoke.InvokeInjector.inject(InvokeInjector.java:82)
at app//org.spongepowered.asm.mixin.injection.invoke.ModifyArgInjector.inject(ModifyArgInjector.java:103)
at app//org.spongepowered.asm.mixin.injection.code.Injector.inject(Injector.java:276)
at app//org.spongepowered.asm.mixin.injection.struct.InjectionInfo.inject(InjectionInfo.java:445)
at app//org.spongepowered.asm.mixin.transformer.MixinTargetContext.applyInjections(MixinTargetContext.java:1377)
at app//org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyInjections(MixinApplicatorStandard.java:1062)
at app//org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:402)
at app//org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:327)
at app//org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:421)
at app//org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:403)
at app//org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363)
... 12 more
It appears it's conflicting with Icarus (on fabric 1.20.1) and crashed while initializing the game.