The permissions granted to user 'NT AUTHORITY\NETWORK SERVICE' are insufficient for performing this operation. (rsAccessDenied)

Hi,

Below is the Error when i tried to Acess the Report.

In Application Pool i set the Identity as NetWorkService.

The permissions granted to user 'NT AUTHORITY\NETWORK SERVICE' are insufficient for performing this operation. (rsAccessDenied)

I followed the Below Steps, Still I didn't get solved the Problem,

1. Go to the reports manager (http://servername/reports)
2. Switch to the property tab 
3. Create a new group with name BUILTIN\Users , NT AUTHORITY\NETWORK SERVICE ,NT AUTHORITY\ISUR
4. In the role assignment tick browser role.

Can any one please help me to solve the ISSUE.

Thanks,