Safari on the iPhone has a WebKit encountered an internal error
I have an iPhone 5S with iOS 9.0 (13A344). Yesterday Safari stopped working. It says: Safari cannot open the page. The error was: "WebKit encountered an internal error". I've tried shutting down the phone and restarting. That didn't work. Nor did resetting the phone by holding down the Home button and the Sleep button. Does anyone have any ideas? Thanks
iPhone 5s, iOS 9