Windows Media Player cannot play the file because the associated Windows Media metafile playlist contains too many nested playlists. A nested playlist contains another playlist, which in turn might contain another playlist, and so on.
A metafile is a file that contains information about other files. A Windows Media metafile playlist, which might have an .asx, .wax, .wmx, or .wvx extension, can be used to instruct the Player to play a group of digital media files in a specific order. Metafiles are usually created by a content provider, such as an Internet radio station.
If you created the metafile, reduce the level of nesting. For information about creating valid Windows Media metafiles, see the Windows Media Player Software Development Kit (SDK) at the Microsoft Web site.