I am attempting to add BCLib to my mod and followed the instructions in the README here. I added the version that is required for my mod version, 3.30.1, and added it as a dependency in my build.gradle. It gave me an error saying I needed to add a compatible wunderlib version, so I did that too, adding 1.30.1. However, when running my mod, I still get errors that results in a crash before minecraft fully loads. I copied code from your better end mod, code in its gradle.build, gradle.properties, fabric.mod.json, and settings.gradle to no avail.

I get an error dealing with AnvilScreenMix (method_25402 does not exist), but that doesn't crash the program. Then later, I get a field_22785 does exist error in WelcomeScreen of BCLib, specifically line 39, which came from LayoutScreen from WunderLib. I don't know what else I need to do to get this to run properly, but any help would be appreciated.