[11:45:32] [main/WARN] [mixin/]: Reference map 'dummmmmmy-forge-refmap.json' for dummmmmmy.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'suppsquared-common-refmap.json' for suppsquared-common.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'suppsquared-forge-refmap.json' for suppsquared.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'smallships-forge-refmap.json' for smallships.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'jeitweaker.refmap.json' for jeitweaker.forge.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'jeitweaker.refmap.json' for jeitweaker.common.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'dummmmmmy-forge-refmap.json' for dummmmmmy.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'suppsquared-common-refmap.json' for suppsquared-common.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'suppsquared-forge-refmap.json' for suppsquared.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'smallships-forge-refmap.json' for smallships.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'jeitweaker.refmap.json' for jeitweaker.forge.mixins.json could not be read. If this is a development environment you can ignore this message
[11:45:32] [main/WARN] [mixin/]: Reference map 'jeitweaker.refmap.json' for jeitweaker.common.mixins.json could not be read. If this is a development environment you can ignore this message
Add the full crash-report or latest.log (logs-folder) with sites like https://paste.ee/ and paste the link here
https://paste.ee/p/UM11D
Add autoreglib
https://www.curseforge.com/minecraft/mc-mods/autoreglib