CODEWITHSUNDEEP
ios-simulatorios8xcode6
Eliza Wilson
Eliza Wilson

Reputation: 1101

Why is iOS Simulator not running?

When I try to run my program, iOS Simulator goes black and displays this error:

Unable to boot the iOS Simulator

Unable to boot the iOS Simulator.

When I click OK, Xcode shows this error:

Unable to run app in Simulator. An error was encountered during running (Domain = NSMachErrorDomain, Code = -300)

Unable to run app in Simulator. An error was encountered while running (Domain = NSMachErrorDomain, Code = -300)

How I can I make it run again?

Upvotes: 2

Views: 1632

Answers (3)

Mahesh
Mahesh

Reputation: 1482

Just Reset Content and Settings worked for me. Also clean the project once and build.

Upvotes: 0

Nathan Matthews
Nathan Matthews

Reputation: 81

If you've recently updated XCODE and possibly have more than one installation you may need to specify which XCode is being used via the command line.

sudo xcode-select -s /Applications/Xcode6-Beta4.app/Contents/Developer/

Upvotes: 0

Eliza Wilson
Eliza Wilson

Reputation: 1101

You probably are running two different instances of the iOS Simulator.

  1. Clean the project. (CMD+SHIFT+K)
  2. Quit Xcode.
  3. Quit all instances of iOS Simulator.
  4. Restart the computer.
  5. Log in.
  6. Make sure no instances of iOS Simulator are running (I had a wrong version set to Open At Login)
  7. Run your project, and let Xcode open the right Simulator.

Upvotes: 4

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