Why my iTunes  said my sync session cannot start?

I started the itunes to back up the phone and suddenly it said my sync session could not start? What is that mean? How to fix it?

Hey Baby Boop,
I found an article that addresses that same error message and goes over steps to resolve the issue. First, I would try simply restarting the computer and the iOS device, and that may resolve the backup issue. After restarting, attempt to restore again.
If that doesn't work, then go through all of the steps in the article. You need to be logged in to the computer as an administrator to complete the steps. If you're not sure if you have administrator access, contact the owner of the computer or the system administrator (if it is your personal computer, you should).
iOS: Troubleshooting backup issues in iTunes
http://support.apple.com/kb/ts2529
Regards,
David

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