It looks like you're using an old Xcode (e.g. 5.0) and a device running iOS 7.1. That the warning your get, i.e. MT1108
.
Such a configuration can work (most of the time) but will have a few drawbacks. E.g. the code that ships with Xcode cannot talk to the device (to start the application). That what's happening with the error, i.e. MT1007
.
If you cannot update your Xcode (to 5.1) then you'll need to start your application manually (tapping on it's icon). Once it starts it should connect back to the debugger and you'll be back to normal.