Notes:
appears to be looking for a client side class during server startup
internally you have designated as 1.7.9999.custom

crash report:
https://gist.github.com/9c6bd2fd6c02427047324ec483a77a93

fml server latest:
https://gist.github.com/1f51cd66987b797d9bd3eb484212f710

Same thing happened on a client startup.

https://gist.github.com/kreezxil/37f4b8ae919b21960cfa63ae2e421c3f

I realize in retrospect that this is a duplicate of #92, so I have moved all of my ramblings to that one.