title: Facebook login "given URL not allowed by application configuration"
body: <p>I've added facebook login to my site.  However, when I click the button, I get a red box that says:</p>
  
  <pre><code>Invalid Argument
  
  Given URL is not allowed by the Application configuration.
  </code></pre>
  
  <p>If I continue to login then I get:</p>
  
  <pre><code>API Error Code: 100
  API Error Description: Invalid parameter
  Error Message: next is not owned by the application.
  </code></pre>
  
  <p>Not sure exactly what the problem is.  Any thoughts are appreciated.</p>