What is your question?

can someone help me fix it please ? ( i will send screen shot when i put the mod what happens )

Thanks for this report - could you isolate the mod on its own to determine whether it is indeed this mod, and provide the mod version, your Fabric API mod version, modloader version, and MC version? If you're using a custom Java runtime/a custom launcher please include your Java distribution too if possible!

I've investigated this a tiny bit further - turns out that Feather is just incompatible with this mod due to conflicts with accessing the same areas of the client