Whenever I join my server my Minecraft crashes with this error: https://paste.dimdev.org/bilowiwuko.mccrash

I have the latest version (primitivemobs-1.2.2a).

No idea what's happening here. Are your server and client configs the same; like are the same mobs disabled/enabled? Cause for what I can tell a datamanager is trying to check if an Integer is Present on the client side but then finds nothing. Or something like that.

The config from the mod was directly uploaded from the client to the server. They should have no difference. From what I can tell, I do not see anything difference just looking through both configs.

Client Config: https://hastebin.com/afiquraqiw.coffeescript
Server Config: https://hastebin.com/fazilucata.coffeescript

I tried this here locally and did not get this after many attempts. Not sure what's wrong here. Possibly related to the way its set up or another mod?