fishtraps-1.0.5.jar

[18:05:05] [main/WARN]: Reference map 'fabric-refmap.json' for fishtraps.mixins.json could not be read. If this is a development environment you can ignore this message

I have this too, and afterwards, the game crashes.

This is just a warning since I left the empty json in the project without any mixins, which is why i havent updated it removed.
It will be gone for 1.15 but it wouldn't cause the game to crash

removed unused mixin file