ITunes won't open after transferring songs from old Mac.

I recently got a new MacBook Pro and used my external HD to copy and paste my songs from my old computer to the new one. It seemed to work immediately, but ever since I closed iTunes after the transfer, I cannot open the application at all. What I get is this error message:
I've tried to re-install iTunes; that made no difference. I looked into Finder to see if my files were still there, and there was no change. All of the songs play if I open them in Quicktime, but I get the same error message as above if I try to open them in iTunes.
Let me know if anyone knows what to do here. Thanks in advance!

Hi, mbuco12. 
Thank you for the question.  This sounds like you will need to rebuild your iTunes library file.  Below, I have included the article that walks you through this process.  Start with the section labeled Re-creating the iTunes Library file.
iTunes: How to re-create your iTunes library and playlists
http://support.apple.com/kb/ht1451
Cheers,
Jason H.

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