and another question is, can I play the mod without Green? If I can, what content do I lose as a result? or what kind or errors do I get?

try it out

I can't. Since green is marked as required mod, I can't create a server without green enabled.

Yeah I was going to try it too to see what would happened. Obviously nothing since you can't disable it. My game has been crashing too, and I can only play this mod in offline mode. Contact the developer on his discord and send him your crash log, that way he can try to get this problem fixed.

Hello, now if you disable the lavaarena biome the green mod will not be required.

Hey I found a way to fix this! Un-Subscribe from the Green mod, then re-subscribe. Can't believe that worked lol.