Having issues trying to load other mods into my development environment...

Hi, I'm trying to make an addon for Farmer's Delight, but I'm having a few issues trying to actually get farmer's delight into my workspace. When I place my mods that I wanted to use (farmer's delight, jei) into my workspace, I get this crash. A similar thing happens no matter what mods I try and do this with. https://gist.github.com/SlayDigger/12e9b9aa91a14212bde0d81f80b4e624

Is there another way that I have to do this ? I've looked around online and all I've seen were to use a plug-in that hasn't been updated for new versions of mcreator.