1.12.2 Fatally Missing Registry Enters

[dnlpnvr]

Hello! So, some friends and I are trying to set up a modded Aternos-based server. The problem is that we can put up the server online but when we try to connect to it, the error in the title occurs. We have the mods instaled in the server and in our client and it still doesn't work. Anyone can help?

 

Here's the server logs:

https://mclo.gs/j9FLsru