title: Failing to publish a Windows Forms project
body: <p>I am trying to click on the project and publish it. But what I get is this:</p>
  
  <blockquote>
  <pre><code>Error 94  An error occurred while signing: Failed to sign
  </code></pre>
    
    <p>bin\Debug\app.publish\setup.exe. SignTool Error: The signer's
    certificate is not valid for signing. SignTool Error: An error
    occurred while attempting to sign:
    bin\Debug\app.publish\setup.exe  CHATT3R</p>
  </blockquote>
  
  <p>What does it mean?</p>