error when trying to use FaceTime
facetime previously worked fine on my daughter's macbook pro with lion, now when opening facetime it asks for the password, flashes verified for a second, then gives this error: 'the server encountered an error processing registration, please try again later". don't even know why it's trying to process registration and if it helps, facetime is working fine on my macbook pro on the same wifi network and it's working fine on her iphone, again on the same network. thanks for any help.
MacBook Pro, Mac OS X (10.6.8), iPhone 4 iOS 6