This was a bitch to track down.
Basically it means Xcode is not able to attach a build of your app to the simulator. I was, however, able to build it directly on the iPhone. To solve this problem, simply do the following:
* Click on Simulator and reset the simulator by going to the “iOS Simulator” main menu and choose “Reset Content and Settings…
* Back in XCode, choose the menu "Product" > "Edit Scheme"
. On the left menu panel, click on "Run <em>Your_Project_Name</em>.app" > "Run _Your_Project_Name.app"
. The info display on the right should have the "Debug Process As"
radio button picked as "Me (your-user-name)"
. If not, make sure you do not login as root. On Stackoverflow there are many reports of running as root will have problems
* Next, still in Xcode, go to the menu "Window" > "Organizer"
. On the top menu, click on "Projects"
. Go ahead and delete "Derived Data"
.
* Finally, go to "~/Library/Application Support/iPhone Simulator/6.0/Applications"
and delete everything that’s in there
Restart Xcode and the simulator. And Bob’s your uncle.