Error while setting server report parameters.The permissions granted to user are insufficient for performing this operation(rsAccessDenied).After given this error

Hello Experts,

Watch above in the screenshot, i have given permission to the user,but agin same errorError while setting server report parameters.The permissions granted to user are insufficient for performing this operation(rsAccessDenied).Further, when i am trying to give user permission on report server error on report server "The group or user already has a role assignment on"

Thanks and Regards,

Shabir Ahmad