Q: iTunes unknown error 13010

Be very careful if you delete iTunes Library.itl  I had to spend weeks trying to get my library back I lost all play list ratings and how many times a song had been played.   I never was able to get the information back even with 3rd party apps from my ipad, Iphone, & Ipods.  

I had a different problem with the same 13010 error message: iTunes wasn't letting me import an mp4 music video.  I deleted genius like you said, and that did the trick!

Thanks!!!

I also tried removing the Genius library - now I don't even get an error message - iTunes just freezes when I try to launch it and doesn't appear in the finder.  All I can see is "Application not responding" when I Cmd-click on the iTunes icon in the dock.  Reinstall?

Worked perfectly thanks

Worked for me. Much appreciated.