My iphone won't let me log into facebook and pops up with error 1200?

As I go on to log onto facebook it says error occurred:1200(NSURLEErrorDomain) what do I do it won't even let me on safari?

Try logging in to a computer or other device it sounds like a problem with the app or something with your phone if another device is not possible try downloading new facebook app and see if it works. Worth a try.