Be sure that you’re running the right modloader, version, and Java runtime.
Then from there I’d suggest only adding a couple mods at a time to see which work on the server, and which don’t
It looks like Biomes O’ Plenty is the issue. Looking around online, it looks like I need to type in the console command /fml confirm or Dfml.queryresult=confirm
This might be a stupid question, but how do I do that? Every time I try to type into the console, it does not let me.