title: Trouble with the private key for "myName" is not installed on this mac
body: <p>I tried to validate my xcode project but it cause error that 'the private key for "my name" is not installed on this mac" </p>
  
  <p>Because this project was created by another Mac Computer.And that has broken. So , I can't export this private key to it which I am using .</p>
  
  <p>Do you have any idea?</p>
  
  <p>Thanks in advance</p>