Internal Server Error on my 1.7.10 Forge Server

Hi, today I've been trying with my friend to create a new server on 1.7.10 Forge but when we tried to enter, we got the same error all the time. Maybe it is because of some mod that can create an error but I cannot locate it, I would like to be able to receive help. I attach an image with the error.

Here you have c: https://mclo.gs/ghBsu7Y

I'll check it now, thanks.

It works!! Thank you so much buddy! ;3