Hello! I've been having trouble playing quark since there is an issue with the 1.15.2 version. I have no clue what to do and I need help.

Quark (quark) encountered an error during the common. setup event phase Non La-20-9/ -] character in path of location: minecraftnetherracklminecraft:the_nether

Try deleting your quark config, that should regenerated it and fix the issue