title: Feed Dialog not working on iOS SDK 3.0 beta (API error code 110)
body: <p>I am updating my app to use the new Facebook SDK for iOS (3.0).  However, I have run across an issue trying to use the feed dialog.  I followed the <a href="http://developers.facebook.com/docs/howtos/feed-dialog-using-ios-sdk/" rel="nofollow">instructions</a> on Facebook's developer website regarding how to use the feed dialog with the new SDK, but I am getting this error when I show the dialog:</p>
  
  <blockquote>
    <p>API Error Code: 110<br>
    API Error Description: Invalid user id<br>
    Error Message: Missing user cookie (to validate session user)</p>
  </blockquote>
  
  <p>Here is my code:</p>
  
  <pre><code>Facebook *facebook = [[Facebook alloc] initWithAppId:FBSession.activeSession.appID andDelegate:nil];
  
  facebook.accessToken = FBSession.activeSession.accessToken;
  facebook.expirationDate = FBSession.activeSession.expirationDate;
  
  NSMutableDictionary *feedParams = [[NSMutableDictionary alloc] init];
  
  [feedParams setObject:self.video.alternateLink.href
                 forKey:@"link"];
  // link title = video title
  [feedParams setObject:self.video.title.stringValue
                 forKey:@"name"];
  // link picture = video thumbnail
  [feedParams setObject:self.video.mediaGroup.highQualityThumbnail.URLString
                 forKey:@"picture"];
  
  NSDictionary *privacyDict = [NSDictionary dictionaryWithObjectsAndKeys:@"CUSTOM", @"value", @"SELF", @"friends", nil];
  SBJSON *jsonWriter = [[SBJSON alloc] init];
  
  [feedParams setObject:[jsonWriter stringWithObject:privacyDict error:NULL]
                 forKey:@"privacy"];
  
  [jsonWriter release];
  
  [facebook dialog:@"feed"
         andParams:feedParams
       andDelegate:self];
  
  [feedParams release];
  
  self.facebook = facebook;
  [facebook release];
  </code></pre>
  
  <p>It seems like an authentication problem, but I am passing a valid access token to the Facebook object, so I'm not sure what the problem is.  If anybody could help me, that would be great.  Thanks.</p>