title: FBSDK startForMyFriendsWithCompletionHandler giving error 400
body: <p>I am trying to retrieve list of FB friends which use the app. It was working fine until last month. I just realized that it is not working any longer. I am using the following block to achieve the results: </p>
  
  <pre><code>[FBRequestConnection startForMyFriendsWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
                  if (!error) {
      }
      else
  {
  NSLog(@"%@",error)
  }
      }];
  </code></pre>
  
  <p>But quite contrary to previous results, Now I get the following error:</p>
  
  <pre><code>Error Domain=com.facebook.sdk Code=5 "The operation couldn’t be completed. (com.facebook.sdk error 5.)" UserInfo=0x174278280 {com.facebook.sdk:HTTPStatusCode=400, com.facebook.sdk:ErrorSessionKey=&lt;PFReceptionist: 0x174026dc0&gt;, com.facebook.sdk:ParsedJSONResponseKey={
      body =     {
          error =         {
              code = 100;
              message = "(#100) Unknown fields: username.";
              type = OAuthException;
          };
      };
      code = 400;
  }}
  </code></pre>
  
  <p>Has the facebook sdk changed lately? It might be so because I can't get the gender and date of birth too now, which I was able to retrieve before. What do you reckon is the issue? How can I retrieve the friends who are using my app, as it is quite crucial for my app?</p>