title: The type string is expected but a type integer was received with value 0
body: <p>I am working on Marketing APIs. I want to hit this Api to get Estimate of Target Audiences, basically how much users will be able to see my ad.</p>
  
  <pre><code> "https://graph.facebook.com/v2.2/{adaccountid}/reachestimate"
  </code></pre>
  
  <p>I am getting the response until I pass this parameter "flexible_spec". Whenever I pass this parameter I get this response "The type string is expected but a type integer was received with value 0". I searched for it but no solution was there.</p>
  
  <p>I will show you what I tried until now:</p>
  
  <pre><code> 1)"https://graph.facebook.com/v2.2//{adaccountid}/reachestimate?     targeting_spec={"geo_locations":{"countries":   ["IN"]},"flexible_spec":{"interests":["6006289279425"]}}
   2) "https://graph.facebook.com/v2.2//{adaccountid}/reachestimate?     targeting_spec={"geo_locations":{"countries":   ["IN"]},"flexible_spec":{"interests":["Movies"]}} 
   3)"https://graph.facebook.com/v2.2//{adaccountid}/reachestimate?     targeting_spec={"geo_locations":{"countries":   ["IN"]},"flexible_spec":{"interests":["id":"6006289279425","name":"Movies"]}}
  </code></pre>
  
  <p>I have tried sending an array of ids in flexible spec interests  , array of name's in flexible_spec interests and I have also tried sending <code>list&lt;interests&gt;</code> in it. But no luck.</p>