PLEASE HELP, FATALLY MISSING REGISTRY ENTRIES FORGE 1.12.2

I made a modded server with my friends and so far it was doing great, suddenly when we tried to join all of us got this message "FATALLY MISSING REGISTRY ENTRIES". I was wondering if any of you guys know what to do in this situation here is the log of the server.

https://mclo.gs/b27lCLY