Trying to update apps on phone via computer

Keep getting this message:

This computer is no longer authorized for apps that are installed on the iPhone “Andrea Campisi’s iPhone”. Would you like to authorize this computer for items purchased from the iTunes Store?

When I say yes, and put in my password, it tells me...

This computer is already authorized including this one, you have authorized one computer out of your available 5. I hit ok, and it brings me back to the first message...

Can't seem to update my phone on the phone or computer...help