SharePoint: Report Viewer Session State

If you encounter an error message :-
"Session state has been disabled for ASP.NET. The Report Viewer control requires that session state be enabled in local mode."

Quick Fix

1. Run the following command in
• Enable-SPSessionStateService –Defaultprovision
2. Open the web.config file, search for enableSessionState 
3. Update the value of enableSessionState from false to true