Casio 575E1A User Manual page 78

Using the SMF Player
SMF Player Error Messages
The following explains what you should do when an error message appears in the SMF Player Mode.
Error Message
Err Not SMF0
Err WrongDat
E-76
Cause
You are attempting to play SMF data that is
not Format 0.
There is a problem with the SMF data you are
trying to play or the data is corrupted.
Action
Use only Format 0 SMF data.
Use different data.