One of more files was not exported V4.25

Hi All,

I started having this issue recently after i upgraded.

Basically I import any new tracks I get into existing playlists then use sync manager to add the new tracks to my usb. from time to time, I will get an error after the sync manager has done its this, saying " One or more of the tracks was not exported".

It seems each time it is about 5 random tracks, not necessarily the new tracks, and then when I right click to relocate, they are right there in the folder where they belong, where they were originally imported from, then I "relocate" them everything is fine. a few syncs later another five or so tracks cannot be  exported.

Whats going on?

Cheers in advance.