If it’s only one, seems like the file has no index, usually due to a broken file (incomplete for instance)
In this case take your SD Card or USB drive to your PC and try to play the file.
You have to try file that fails, not the original file your copied from which is probably already on your PC and may work because it hasn’t been (badly) copied.
Come on if you want perople to help you have to feed them with data, at the minimum how many files fail, are they all the same type, the file format(s) (precisely, not just the extension) for audio and video, the duration(s), what support they’re on (if SD card what size and make),…