There is no song in SD Card

Hello, I have an issue with my beatbuddy pedal. I probably messed something up accidentaly and now, when I insert an SD card into the pedal, it says “no song”. The thing is that everything works properly in beatbuddy manager - I have everything there and I can do everything. I would appreciate if someone could help me figure out what happened and what I should do.

Thank you so much for your help. I managed to solve the problem