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Have a look at previous posts in this thread, just bout all the reasons for this have been covered already.
But, chances are that the file-paths in the playlists are wrong.
Either the playlists or the songs have been moved since you created them, or the file-paths have a drive letter in them.
The easiest way to check this and sort it out, is to open one of 'em up in something like Notepad and have a look...
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