[FSoD] New Class Problems

So, me and my friend made a server. We added a ton, and I decided to try to add a class. I tried it and everything worked; the graphic worked, I made a unique skill for it, and almost everything else. However, one thing about it didn't work. It wouldn't actually let me make the class. I would click it, and a weird screen would pop up (Screenshot below). I clicked Play and it just has a black screen (I've tried to wait it out, nothing happened for 10+ minutes). Another weird thing with it is that if you just load up the server and go in and try to create the class, it isn't there. You have to enter nexus and then go make a new character for it to show up (and for it to count for your star count).

TL;DR
Can't create my class but it's in the classes menu.

Weird Screen (Imgur)