Error when loading midi file on PSR SX900

[benn2004]

 I have a new PSR SX900. I've played several midi files however, I just purchased some new midi files from the PSR site and when I try to load them I get an error message. I can see the files on the usb however, when I try to load one, I get this message "Data has not been loaded properly."

Any suggestions? I'm trying to access them thru the MIDI player? Am I missing something or doing something wrong?