no players can connect to my CurseForge Feed the Factory server

When players (Including me) try to connect to my CurseForge Feed the Factory server they instantly get disconnected and get the error in the attachments. I also downloaded the world file and opened it on single player but it deleted a bunch of instances and I couldn't find a lot of items in the jei anymore.

the log of the server is: https://mclo.gs/N40G8ND

how do I fix this?

server and client have the same modpack version and we have reinstalled the modpack on the client and nothing changed. we also reinstalled the modpack on the server and reuploaded the world and still it didn't work.