title: Why can't I code sign this Mac app?
body: <p>I started some days ago a small Mac app for Mac OS X Lion. I've never uploaded a Mac app before, so this is the very first time.</p>
  
  <p>This is what I've already done:</p>
  
  <ul>
  <li>Created App ID</li>
  <li>Created Certificate</li>
  <li>Installed Certificate</li>
  <li>Created a Production Provisioning Profile</li>
  <li>Changed the App ID to my generated one</li>
  <li>Created a new Configuration based on "Release"</li>
  <li>Changed its Code Signing to 3rd Party Mac Developer Application</li>
  <li>Selected the "Production"-Configuration which I created for the Archive-Scheme</li>
  <li>Archived the Application</li>
  </ul>
  
  <p>Now I wanted to "Share" the Application. Xcode (4.1 btw) said to me, there were no valid signing identities. Does I need to add an Entitlement.plist like in iOS? Have I forgotten something?</p>
  
  <hr>
  
  <p><strong>Update:</strong></p>
  
  <p>I just figured out, that I have to sign my app twice. I've still selected "3rd Party Mac Developer Application" but I can't select the Installer cert while submitting my app.</p>