I have no clue about the first error but I did fix the other one.
thanks for letting me know
Viewing post in Symphony of the Four Spires jam comments
Tried again and still have the same error. And while the screen is black, I can still open the menu. My personal suspicion is that you used Fadeout screen and forgot add Fadein afterwards (I've done that too). That or there's some transition glitch.
Still enjoyed the majority of the game. Congrats on your submission.