title: (#100) For field 'insights': period must be one of the following values: day, week, days_28, month, lifetime",
body: <p>Good day, </p>
  
  <p>I have a problem when I try to get the metric values of facebook ads api.</p>
  
  <p>I'm learning about the Facebook API and that's why I don't understand some things. I've tried in several ways, but nothing works.</p>
  
  <p>This is my URL from graph API explorer: <a href="https://graph.facebook.com/v3.3/2169954096621238/insights/page_fans_city/EAAhZAgMuzLKgBAMEZASZAmTf5lPyMEV6ZAO3HhA3xm0PHs69ZBsJnlt4uCWC4RfJE2wvUtl06ecmayRqDHvcCnf92QcwOAAoGRWKTZAauMByG0X2RUqcPSrA4damZBwVLMfbooNvtQE1INduI1tKdQQOazcm2OYGgkN755lO1mna6350bNfNYTfEJONHCbO0ldPTE5d05OkuwZDZD/" rel="nofollow noreferrer">Graph API Explorer 1</a></p>
  
  <p>This is the error that throws me: </p>
  
  <blockquote>
    <p>(#100) For field 'insights': period must be one of the following values: day, week, days_28, month, lifetime</p>
  </blockquote>
  
  <p>This is the graph API explorer link where my url is: <a href="https://developers.facebook.com/tools/explorer/?method=GET&amp;path=2169954096621238%2Finsights%2Fpage_fans_city%2FEAAhZAgMuzLKgBAMEZASZAmTf5lPyMEV6ZAO3HhA3xm0PHs69ZBsJnlt4uCWC4RfJE2wvUtl06ecmayRqDHvcCnf92QcwOAAoGRWKTZAauMByG0X2RUqcPSrA4damZBwVLMfbooNvtQE1INduI1tKdQQOazcm2OYGgkN755lO1mna6350bNfNYTfEJONHCbO0ldPTE5d05OkuwZDZD%2F&amp;version=v3.3" rel="nofollow noreferrer">Graph API Explorer 2</a></p>
  
  <p>Thanks.</p>