This isn't well documented as being a client-only mod on the CurseForge page, but as far as I can tell from the comments, it is. You should probably deactivate/remove this mod on the server side.
UCE CustomMainMenu{1.9.2} [Custom Main Menu] (CustomMainMenu-MC1.7.10-1.9.2.jar)
Presumably also client-only - I haven't actually set up a server myself, but I'm guessing it doesn't show a main menu to be customized. Same author, and I also found a comment requesting the author to add an annotation to tell Forge not to load it on server-side.
I belive it is an incompatibility with a mod but im not sure. Thanks in advance!
https://pastebin.com/B8prrK6j
One problem is noticed: lower the render distance.
"We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far."
I lowered the render distance to two and it still crashed.
This isn't well documented as being a client-only mod on the CurseForge page, but as far as I can tell from the comments, it is. You should probably deactivate/remove this mod on the server side.
i deleted it and got a new error
https://pastebin.com/eNGfccdA
Presumably also client-only - I haven't actually set up a server myself, but I'm guessing it doesn't show a main menu to be customized. Same author, and I also found a comment requesting the author to add an annotation to tell Forge not to load it on server-side.
I found the problem! I installed each mod one by one and forgot that CustomMainMenu is a client side mod and put it in the server mods folder.