An 8302 basically means the file can't be read.
Causes of an 8302 error:
- the file is damaged or corrupted
- the file is missing or has been moved
- there is a network communication problem (if loading over a link)
What might cause the above:
- the firmware of the player is out-of-date
- a cheap USB drive with low quality components
- drive failure
- power saving has activated
- the drive isn't receiving adequate power from the CDJ (only an issue with certain models of external USB-powered conventional hard drives)
- user moved or changed files or folders in the drive's /CONTENTS folder
- the drive was removed from a player or computer while in use and the drive table of contents is damaged
- the USB host on the CDJ is damaged
- there is another hardware fault in the CDJ
- the ethernet cable used is defective or is not seated properly
- one of the pins in the ethernet jack is not aligned properly causing a communication error
- the socket of the ethernet jack has failed on the board of the CDJ
- the network hardware between CDJs is managing traffic, causing packet loss or blocking communication
Use the above information to try and troubleshoot what your issue might be.
For problems related to USB drives, it may simply require a formatting and re-export of the contents, but if the problems persist, try using a different make / model of USB drive.