So I recently re-typed in the key for Litterbox, an easier way to edit and make MML's without typing letter by letter (NDKJR3X3), but there's a syntax error around the beginning, someone tell me why and what's preventing it from working? You can also give some keys for MML editors, just make sure it's Synthesia-like. (I'm only use to those.)

Are you running this from the project viewer or through DIRECT mode? Make sure to run the program while the program has access to its project folder. Otherwise, it might not have access to files necessary to run correctly.

The active folder has everything it needs. It's saying "Syntax error at 1.1"

Oh! Nevermind it's working!