title: Can't read PKZip signature validating app for App Store
body: <p>I am attempting to submit a new version of my app to the App Store.</p>
  
  <p>I am using Xcode 6 GM.  The previous version of this app was submitted with Xcode 5.1 without issue.</p>
  
  <p>After I generate the app archive, I click "Validate..." in the organiser.  Xcode takes me through the process of selecting my developer team and verifies the provisioning profile that will be used.</p>
  
  <p>It then starts to generate the package before failing with the message</p>
  
  <blockquote>
    <p>ditto: Couldn't read PKZip Signature
    Unable to extract archive.  Please make sure /var/....path to .pkg  is a valid zip or ipa archive.</p>
  </blockquote>
  
  <p>I have navigated to the directory and tried zip on the command line - this gives an error.  If I rename the file to .zip then Finder is happy to unzip it, but Zipeg also returns an error.</p>
  
  <p>What I have tried:</p>
  
  <ul>
  <li>Build->Clean </li>
  <li>Recreated the provisioning profile</li>
  <li>Recreated my signing certificate</li>
  <li>Checked all of the "code signing" settings are the same as for my other projects that work</li>
  </ul>
  
  <p>I have also looked into the log files that are created by the packaging process and there is nothing untoward listed until the error about the invalid zip file.</p>
  
  <p>Has anyone seen this?</p>