Tracks

Hi,

I have a problem with the reading of the tracks with my rekordbox 4.2.5,
not read me some tracks loaded on the playlist
after loading them, if I open and I close the program, It tells me that the file is not there...can you tell me why'?

Thank you very much.

Maurizio

after loading them, if I open and I close the program tells me that the file is not 'presente..sapreste tell me why'?