Okay, i have been using aternos for a while now and i have made many mod pack smp's to play with friends but i have never seen this before.
The server loads up fine with no crashes (so does my forge) but when i try to connect to the server it comes up with "fatally missing registry entries"
[Blocked Image: https://i.imgur.com/nGu1jCU.png]
I have seen a few posts with the same problem but there is always "im not sure what that is" and nothing else so please help me here. I am literally desperate. (finally i play on 1.12.2 if that helps)