title: Publish custom object returns An unknown error has occurred OAuthException Code 1
body: <p>Using the Graph API Explorer I can reproduce this error using either the app token or the user token.  </p>
  
  <p>Call (POST)</p>
  
  <pre><code>/0000userid0000/mynamespace:Create
  thread=aURLonOurSite
  access_token=xxxxxx
  </code></pre>
  
  <p>Response</p>
  
  <pre><code>{
    "error": {
      "message": "An unknown error has occurred.", 
      "type": "OAuthException", 
      "code": 1
    }
  }
  </code></pre>
  
  <p>Running the token debug shows that I have the permissions:</p>
  
  <pre><code>Issued : 1346937448 (about an hour ago) 
  Expires: 1352121448 (in about 2 months) 
  Valid  : True 
  Origin : Web 
  Scopes : email publish_actions user_location
  </code></pre>