ios6 - Xcode 4.6.1 error message: Could not launch "<AppName>" 'A' packet returned an error: -1 -

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when try test app on device, error message: 

could not launch "appname"   'a' packet returned error: -1

it sounds low level problem. have replaced cable, makes no difference. when have restarted xcode, app runs on device without problems. after test runs, however, error message reappears.

any ideas causes error message?

any ideas how can prevent error message appears?


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