get insights data of facebook page

Question

I want to get insights data of a facebook page. I have tried with graph api with this url:

https://graph.facebook.com/149279625121774/insights/?access_token=XXXX

but it gives empty data:

{    "data": [
          ],    "paging": {
      "previous": "https://graph.facebook.com/149279625121774/insights/...",
      "next": "https://graph.facebook.com/149279625121774/insights/..." 
     } 
}

'149279625121774' is the page id.

Is anybody help me for this.

Answer 1

UPDATED ANSWER:
Insights can be retrieved only as an array. To read Insights you need

• a generic access_token for the publicly available application_active_users metric
• a generic app access_token for all Insights for that app
• read_insights permissions for all apps, pages and domains owned by this user

For more details on which insights are available please review the FQL Insights table

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Here are my comments:

1. Most likely you don't have the read_insights permission.
2. The user authenticated should be the owner/admin of the page!
3. Remove the trailing slash /