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The problem isn't the CDJ or rekordbox, but the export database has an issue. If the drive is formatted FAT32 it's possible that you removed the drive without ejecting / stopping it first and the database was in use at the time, thus damaging the file. My recommendation would be to format the drive and re-export the contents from rekordbox.
Also note that 6.6.4 is the current version, so you may consider updating.
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