title: Adobe AIR - Unable to build a valid certificate chain for the signer
body: <p>I purchased a p12 certificate but am having difficulty using it. I always get the following error when trying to sign my app:</p>
  
  <p><em>Error creating AIR file: Unable to build a valid certificate chain for the signer.</em> </p>
  
  <p><img src="https://i.stack.imgur.com/OpONC.png" alt="screenshot"></p>
  
  <p><strong>This is not an issue when I sign the app with a self-signed certificate.</strong> </p>
  
  <p>I'm trying to sign a .air file for the desktop. I'm on Mac OSX. Is there anything I must do before using the p12 file?</p>
  
  <p>I have previously (2 years back) purchased a p12 key from the same provider and that one did not have any issue. That key has expired now though. </p>