At first it was meant to register my entities and spawneggs, but then I took a look at your folder to see how you would register your entities, when I saw that you didn't have any entities at all, I looked at the tile entities and tried to imitate it, just for the entities. But since the FantasyModEntities also spawn my entities into the world, I left it there, but any code that has to do with registration, except spawning entities into the world, was converted into a comment.
So I decided to make my own modpack using Twitch's custom profile feature and after I start up the server and try to join it I'm stuck waiting in the logging in screen. The server's console shows that I joined the game and I was even killed by a zombie but from my perspective I could only see the logging in screen in the minecraft client. My friends, who are also able to join the server, also get stuck in the logging in screen.