Server Doesn't Start With Mo' Creatures Mod

I was playing on the server with my sister when we decided to try another mod and chose Biblio Craft, but when we went back to change the software over to Mo' Creatures again the queue would pass but it would shoot from Starting to Stopping and shut down when it worked perfectly fine with the other mods. I try to load up my backups but they were all made with Biblio Craft as well and I'm afraid when I upload a world it won't go through.

Im sorry but where do I find the server log? Ive never done this before

Nevermind I found it my bad

https://mclo.gs/qmy0sIP

No, it still switches to Stopping after Starting.

I tried to type in the commands at the bottom of the console but it would just clear it and nothing would happen.

Update: I got it to run by downloading a new world and overwriting the other