MarkOfTheBeast

I installed some mod source files into the libs file in my dev environment for Ex Nihilo, Mekanism, Metallurgy, and Thermal Foundation (and the core files needed for these). However, when I try to start the dev environment, it fails to load and gives me this error: What do I need to do to fix this? I plan on making a mod that interacts with all of these so removing one is not an option.