The DeveloperCapes library crashes the game when mod is compiled and run on Forge 10.0.13.1187. There is a new version of the library for Minecraft 1.7.10 that I recommend using. A lot of stuff has changed, so take a look here, at line 23 for how to set it up.

https://github.com/DivineRPG/DivineRPG/blob/master/java/net/divinerpg/utils/proxies/ClientProxy.java ?

no, i was giving an example for how to set up a config for the new version.

what version of forge is supposed to be used with this mod?

10.13.0.1180