Quote from Cmasta
Looks like the main issue is the outdated method of changing vanilla classes. I am going to try and make a hotfix for id_miner's 0.8.0 Version So you guys can have at least something to use until I can rewrite the entire mod. I will use this topic for updates until I have successfully rewrote the mod or at least have made a hotfix, then I will start my own topic. I will keep you guys posted!
I have a Quick tip for people that want to use the mod until I provide a hotfix. You can use the 0.8.0 version with the .789 version of forge ONLY with magic launcher.
I hope you can update this mod! :D!!!