title: Facebook API - All Mutual Friends returning error
body: <p>Trying to get my head around it but getting the same error.
  I have created 3 test users(user1,user2,user3) and each have added each other as friends.</p>
  
  <p>Now I want to test the facebook API for all mutual friends by sending the below data :-</p>
  
  <p><a href="https://graph.facebook.com/v2.8/" rel="nofollow">https://graph.facebook.com/v2.8/</a><strong>[user2_userID]</strong>/all_mutual_friends?access_token=<strong>[User1_access_token]</strong>&amp;appsecret_proof=<strong>[app_secret_proof_created_by_hashing_token_and_app_secret]</strong></p>
  
  <p>This is to get the mutual friends between user1 and user2 but I get the below error :-</p>
  
  <pre><code>{
    "error": {
      "message": "(#100) Tried accessing nonexisting field (all_mutual_friends) on node type (User)",
      "type": "OAuthException",
      "code": 100,
      "fbtrace_id": "AlCoK/9o/6h"
    }
  }
  </code></pre>
  
  <p>I even tried with actual users thinking the test users might have some issues but I get the same error.
  Can someone tell me what exactly wrong am I doing here? The document says the same.
  <a href="https://developers.facebook.com/docs/graph-api/reference/user-context/all_mutual_friends" rel="nofollow">https://developers.facebook.com/docs/graph-api/reference/user-context/all_mutual_friends</a></p>
  
  <p>Thanks in advance.</p>