Xcode 9 Simulator Error Unable to Boot the Simulator Launchd Failed to Respond MAC Os Sierra

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

Sample Image

XCode 7.3 Simulator Unable to Boot

Was able to fix the problem by rebooting into recovery mode (hold command+r). Open terminal and run

csrutil disable
reboot

Went back into Xcode and ran the simulator.

Went back into revoery to enable what was disabled. Works fine now!



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