Quakeboy'z Dev Arena

Solution : Delete the existing app on the device and try again. Note : You don't have to do this all the time. It happens only when a version of the app is installed from the AppStore or from an Ad-hoc source like Testflight. I hadn't seen this error before, but it happened to me on XCode - version 6.3.1 (6D1002) with an iPad Air. But around the internet it seems to happen to iPhone 6 and 6 Plus too.

Today while on my SO profile page , I accidentally clicked on their "visited" statistics. (They have a few badges for people who come to the site regularly like 'for n consecutive days' and so on) And then to my surprise I found a neat calendar view of all the days. Though not very useful or anything. It was kinda cool and surprising to see how much my life/career has become dependent on stackoverflow.com