rekordbox usb

Hello,

yesterday I ejected the usb from the cdj (maybe not waiting the light stops blinking). Today I tried to put the usb again in the same Cdj but it doesn't read the usb with the Menu: playlist, key, folder, search, etc... I can only see the menu folder in which there are only the contents organized by artist in different folders.

What can I do to be able to read again the playlists in the cdjs without re-exporting from rekordbox in the Mac to the usb? 

thanks in advance,

Alessandro