Need Help! My custom story works for me but not for others!

[FlawlessHappiness]

The black area is probably just the void, which means you have some holes in your corridor.
What might be a problem is that you have a map .cache file, which you shouldn't have, because that's what causing the problem.
Just delete it.

Also, if you plan to release this mod for the Internet, please post a warning that this mod contains jumpscares and flying naked guys.

It is frowned upon here.