Unable to run app in Simulator: Xcode beta 6 iOS 8

I solved it following these steps:

  1. Open Xcode 6 beta
  2. Go to the menu Xcode > Open Developer Tool > iOS Simulator
  3. Even if an error dialog shows up, you still would have access to the iOS Simulator’s menu
  4. Select Hardware > Device > Manage Devices
  5. Click on the little + sign at the bottom
  6. Add (if missing) all the devices that you want, or delete and recreate the ones malfunctioning.
  7. If anyone of the simulator is not working then right click on it and delete it and then re-create it again

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