I can't update any apps on my iphone?

I have never had a problem updating my apps before. Recently though when i try to update anything a screen pops up and says "Payment Type: PayPal is not supported on this device. To manage or change your payment method, go to the iTunes Store on your computer." i thought it was a little weird because i don't ever remember using PayPal for my iTunes account. Anyways, i went on the computer and went to my account then my payment information. There's nothing about PayPal in there, it's hooked up to my credit card like i thought it would be. I'm really confused because there has never been a problem before and i've had an iPhone for about 3 years now and i've never had any trouble updating any apps until now. It's extremely frustrating because a lot of my apps won't even run without being updated first… What do i do?

I ain't sure what could be the problem it might be the ios7 if you had updated it recently if you can re post again with feedback however for a fast fix you may want to try to create a new account for itune or add actually another free account and that should fix the problem