Sync with Dropbox error - can't load tracks

Hi there. So a bit of a long post but Im panicking here. I have the Proffesional Plan of Rekordbox. I have about 80% percent of my tracks in a Dropbox folder with various folder in the big one. As of a year ago I decided to put all of my new music in an external hard drive. Earlier today I noticed that some of my tracks in various playlists wasnt loading the files to Rekordbox. Then I went on to my page and chose Synchronize all music files. What happened now was that all of my tracks in Dropbox wont load, only the tracks that are on my hard drive. What can I do to sort this out? Please, someone help me. I cant even export music to my USB anymore...