Synced playlist turns gray and wont play on computer

[I am about]

I synced a playlist to mp3 player. Now list is gray and wont play on computer? Did i do something wrong?
I wanted to add to the playlist then resync it to MP3 and also play it on computer.

[Lowlander]

See: http://www.mediamonkey.com/support/inde ... ls-to-play