The iTunes Library cannot be saved an unknown error has occurred (-48)

Every few minutes, I get an error message from iTunes that says:
"The iTunes Library cannot be saved an unknown error has occurred (-48)"
Quitting and restarting iTunes doesn't seem to make the error go away.  All of my music and movies seem to play just fine - not sure why the error keeps popping up - any clues?
- iTunes library is located in it's normal spot (~/user/music/iTunes/)
- OS 10.8.2
- iTunes 10
- iMac 27" early 2010

Thanks again for the gracious response UV.
You've pointed out a problem...there are a lot of WAV files that I have like unreleased live shows of bands like the Beatles, Neil Young, Miles Davis etc that I've gotten off Bittorrent trading. When I look at the "get info" part of the song in iTunes the details that I've hand entered (dates, venue, song, musicians,etc) does show up.
But when I go back to the actual file itself, many are simply tagged something like "track 1" and the only way I currently keep track of all this is how I organize my library ( Musician or Band folder \ Album folder \ indivual tracks). There are literally thousounds of songs that I've entered data for on these WAV files.
Besides getting my current error problem fixed, has anyone who trades live shows come up with an easier way to organize their music. I understand that I may be in the minority with all my WAV files and that many users simply upload CDS, or mostly buy tracks online which is easier to simply grab the data back if they need from some database. I feel like I'm missing out on something big. Maybe I just need a different program for my particular application (archiving & playing music). ANy ideas from other bittorrent traders of unreleased material?
I am learning more and more about how this all works by the minute, and have taken your advice UV about copying all my current library info and putting it somewhere safe. Hopefully this means everything I've entered up until a few days ago will be fine. Still, I have plenty music waiting for me to hear in FLAC files that need to be decoded into WAV files; but I want to wait to do this until I can be certain all my hard work entering data won't go to waste and my error problem has been fixed.
thanks for all insights - Sonny

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