sql reports using pps sharepoint 2010 access denied error

Question

Hi I created a sql server report using performance point services. In the dashboard designer I’m able to see the preview of the report. But when opening the same report in SharePoint site-> Performance point content-> display report I’m getting access denied error .

• The permissions granted to user / are insufficient for performing this operation. (rsAccessDenied)

I have administrator permissions to the site.

Please share the solution if you have done anything similar.