custom background map [SOLVED]

[Mine Turtle]

My custom background map shows up completely black... I've seen other with the same problem, and followed what other people suggested. Didn't work. here is how it looks:



EDIT: I know it says (modified) but i have saved more than once

my guess would be to try adding a bright boxlight over the map, and see if its visible then. if it is, then the pointlight youre using is probably too dim