rekordbox PLAY LIST MISSING AND DELETING FILE WHEN PRESS SYNC

I have just updated my rekordbox to 6.7.1 and when i open rekordbox my playlist folder is missing and when i press sync manager. it starts to erase my track from my usb stick

My playlist seem to be deleted. But my collection  files are there but no play list

can any one tell how to get your playlist back

OWEN  DOUGLAS