Server crashes whenever I use a mod with Spongeforge

One of the mods that I have on my Server keeps crashing whenever Spongeforge is used with it.
Either I dont have it (Its essential to the server), or I need to find another way to get a economy and ranks.

Heres the log of the Crash Report:

Seems to be caused by hbm.

I would report it to them and see what they can do