It means, that you need to re-upload that track again, as it wasn`t uploaded to VOX Cloud. (for some mysterious reason).
YOu may try using following comands:
launchctl remove com.coppertino.VOXCloud /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user rm -rf ~/Library/Containers/com.coppertino.VOXCloud/ killall -SIGTERM cfprefsd
- Press enter.