Just came across this issue myself, the problem was that I had a Entitlements.plist file in the project as part of an ad hoc distribution, and its get-task-allow (ie. 'can be debugged') property was set to NO - setting this to YES fixed the issue and allowed the app to run from Xcode4 on the device in development.
Naturally need to set it back to NO for ad hoc distributions, but just thought I'd mention it in case anyone else comes across the same problem.
I had this issue with Xcode 4.2.1.
For me it was nothing to do with Entitlements file, or Ad-hoc...
I was returning to and old project, and I'd forgotten to add my new iPhone to the provision.
Silly mistake, but also a silly corresponding error message... :-/
If you're using react-native, make sure that the Test target has the same provisioning profile as the main one.
I've had this issue with the iCloud entitlements. My problem was that I forgot to enable iCloud for my App ID in the Provisioning Portal.
After enabling iCloud for your App ID, you will need to recreate the provisioning profiles.
Keep your entitlements file in Target> Build Settings > Code Signing > Code Signing Entitlements.
Go to Target > Capabilities. Toggle On/Off or Off/On one of the capabilities.
Run.
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