Sorry for posting both here and on Discord, but... Whenever I have attempted to build/compile a mod (This is OS X El Capitan by the way), I get an error that says the following:
However, when I update to a newer version of Mono (To get an updated mscorlib.dll), I get a
runtime error, saying it can't find the directory for Mono 4.0.2. So I took the mscorlib from the patched "Terraria.app" and replaced it with the Mono 4.0.2 corlib, and vice-versa, and tested all possible corlib combos, and it would always give me either a
compile or a
runtime error (I assumed this would work since earlier it was saying it "wasn't in sync [with the Mono framework]", and I am typically able to solve these issues on my own, but this one is over my head

).
So I assume that the answer to my question would be, to install a
specific Mono version, and if so, which one?