Can't open iTunes after upgrading

I just upgraded to the newest version of iTunes and now I am getting the following message "The "iTunes Library.itl" cannot be read because it was created by a newer version of iTunes."
I have tried dragging an older version of my library into the Itunes folder but still keep getting the same message. Now I cannot do anything with iTunes and this is extremely frustrating. Any ideas or suggestions on how to correct this?
Thanks in advance
Roya

Had the same problem.
If you have a Mac:
Hold down "alt" and click on your iTunes icon
Click "Choose Library"
Select "Previous Library" folder
Select your most recently dated library
iTunes should now open normally
If you have a PC:
Change the extension of your library file from ".itl" to ".old" and restart iTunes

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