Mixin failures

MixinExtras is missing or too old

What the log looks like

noclassdeffounderror: *com/llamalad7/mixinextras
mixinextras[^\n]{0,60}(?:not|missing|outdated|too old)

How to fix it

  1. Update the mod that needs it — modern mods bundle MixinExtras themselves
  2. An old Fabric Loader cannot supply it: update Fabric Loader too
SeverityStops the game
CategoryMixin failures

Check your own log

Related errors

Mixin failuresCritical injection failure — a mixin could not find its targetTwo mods are usually fighting over the same game methodMixin failuresInvalidMixinException: Mod Mixin Failed to ApplyOpen your latest.log or crash report and look for 'Mixin apply for mod' or the 'Config :' line inside the 'InvMixin failuresInvalidMixinException: Unexpecteded ClassMetadataNotFoundExceptionFind the line saying 'Mixin apply for mod <modname> failed' or 'from mod <modname>' right above the error in yMixin failuresMixin Transformation of net.minecraft.client.main.Main FailedOpen latest.log or the launcher crash output and look at the Caused by lines below Mixin transformation of netMixin failuresMixin apply failed — one mod could not patch the gameThe line names the mixin config, and its prefix is the mod id that brokeMixin failuresMixinTargetAlreadyLoadedException: Required Class Loaded PrematurelyRename your SpongeForge JAR file in the mods folder so it begins with an underscore or 'aaa' (for example, '_s