I manually deleted my app from the iPhone and now I get this error message when trying to run it again from Xcode.
I cleaned the build folder, restarted the device, Xcod
As Marcin's answer suggested, I visited the phone console and in my case, it is this error message:
-[MIFreeProfileValidatedAppTracker _onQueue_addReferenceForApplicationIdentifier:bundle:error:]: 182: This device has reached the maximum number of installed apps using a free developer profile: {(
So if you are signing your app with a Personal Team certificate, make sure that you don't have more than 3 apps.
Read more here: Why can I not install more than three apps?