State Service issue in sharepoint

Question

Dear Team,

 

I have a SharePoint 2010 site where i am creating approval workflows. I can not able to open the task from the task list, it is giving error like " The Form can not be rendered, this may be due to the mis configuration of microsoft sharepoint server state service, please contact your server admin". I am the server admin, i have verified in the central administration site for state service, it is started and running. I have searched many blogs and each and every blog says about start the state service, but it is already started and running.