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copied!<h2>Running App from a Clean Slate</h2> <p>For me the problem did not resolve until I did the following in this order:</p> <ol> <li><strong>Delete the app from the device</strong> <em>(Do this before trying to debug again)</em></li> <li><strong>Quit XCode</strong> <em>(Don't just close the project)</em></li> <li><strong>Delete the app build folder</strong> <em>(example path: /Users/myusername/Library/Developer/Xcode/DerivedData/MyProject-fhkaamuyvqhubaezinqbmxbnaufd/)</em></li> <li><strong>Restart XCode</strong></li> <li><strong>Finally -- Try debugging again on the iOS device</strong></li> </ol> <p>The app build folder of step 3 refers to your app's build folder that is a child of "DerivedData". To find this you can reveal your app in finder, then backtrack until you get to "DerivedData" folder and delete the folder above that like "MyApp-crazylongweirdletters". Without this step (3), I could not debug, so this is a critical step and you must quit XCode before you do this step. </p> <p>For some it appears simply restarting XCode does the trick, but not for me.</p> <p><em>I only post this answer because the earlier answers did NOT work for me.</em> Hopefully others banging their heads will find this and get a sigh of relief. :)</p> <h2>Notes:</h2> <ul> <li>The issue started happening for me when I modified the bundle id of the app.</li> <li>My code signing is and was correct. My provisioning profile was the "Team Provisioning Profile" which should work for any app id (default for "iPhone Developer" automatic profile selector).</li> <li>I was doing a DEBUG build (not release / distribution). </li> </ul>

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