Caused by: org.spongepowered.asm.mixin.injection.throwables.InjectionError: Critical injection failure: Redirector cancelAirIncrement(Lnet/minecraft/world/entity/LivingEntity;I)V in walkers.mixins.json:LivingEntityMixin failed injection check, (0/1) succeeded. Scanned 1 target(s). Using refmap walkers-common-refmap.json
at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.injection.struct.InjectionInfo.postInject(InjectionInfo.java:468)
at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinTargetContext.applyInjections(MixinTargetContext.java:1362)
at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyInjections(MixinApplicatorStandard.java:1051)
at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:400)
at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:325)
at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:383)
at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:365)
at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363)
... 25 more

Which Version did you use? (e.g. Mod-Version: 1.7 - MC-Version: 1.20.1 - Modloader: Fabric)

Mod 1.7, MC 1.20.1 Forge

Which Version did you use? (e.g. Mod-Version: 1.7 - MC-Version: 1.20.1 - Modloader: Fabric)

How did you start the mod? With the Minecraft Launcher or something else?

issue will be closed in 5 days since I tried plenty o' things and never encounterd this issue.

Found some case, where this issue happens (in larger modpacks). I'll work on this now.

@123hongte Alright, I was able to terminate the error, please use Forge 47.1.0 (the recommanded version for 1.20.1, not the latest)

I'll try to finally fix it in 1.9

I could determinate it up to this: MinecraftForge/MinecraftForge#9525 , and hoped, that this might fix it, but it didn't: MinecraftForge/MinecraftForge#9680 .
Maybe I'll find a workaround.

sadly didn't work with neoforged- I gotta wait for them.