Basically, the mod Simple Grinder was using the Ender Biotite from Quark in its recipe for a grinder for some reason and I thought I could fix this by disabling Ender Biotite (because I'd really rather not spawn it in or have to wait until I go to the end to be able to have a grinder), but instead, it just crashes the game. Here's the crashlog:

https://pastebin.com/ee6KWPJ0

This is on their end.