No problem, this particular issue 'as even me stumped a bit so questions are to be expected.
And the tk_izu file is just a dev branch file, if you don’t have that particular one don’t worry. Just means you’re running release builds!
Now, this most recent error is interesting. Unless you moved the require() line that lists the corroutine files to the top, everything prior to that one successfully loaded including the monster_attacks file that wasn’t loading before. Is there any difference between the two require line for monster_attacks and the require line for coroutines?