Why can't itunes start a backup session with my iphone?

When i hook up my iphone via USB, itunes automatically does a sync and backup but recently i've gotten the notification that itunes can't backup my iphone because a session can't be started. Also, my ios 7 beta 1 just expired so currently, i can't get in to my phone- long story short, is there any way to fix this back up problem without having to change anything on my phone? Also I've read that it helps if you uncheck 'sync over wi-fi' on itunes; i did this and it didn't help.

Added (1). I want to backup so that i can downgrade back to ios 6.4.1. Do i still need to get a registered UDID?

You need to get your device's UDID registered as soon as possible. Until iOS 7 comes out, you won't be able to do anything with your phone but upgrade to a newer beta, and it's not possible unless your get registered. I did mine at http://www.instantudid.com/ for $5, and I haven't had any issues with iOS 7.

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