title: Code signing is required for product type 'Application' in SDK 'iOS5.1'
body: <p>I am using xCode 4.3.1. After i created a project, i build it and tried to Archive. Then i got an error saying; (This is my first project in xCode 4.3.1)</p>
  
  <blockquote>
    <p>CodeSign error: code signing is required for product type
    'Application' in SDK 'iOS5.1'</p>
  </blockquote>
  
  <p>What does this mean ? and how to solve it ?</p>