SharePoint 2010 Form cannot be rendered

The form cannot be rendered. This may be due to a misconfiguration of the Microsoft SharePoint Server State Service. For more information, contact your server administrator.

If you’re getting this error, chances are you haven’t added the state service. To add the state service, you need to run some PowerShell commands, I created a small script to run it for you, download Add-StateService.ps1 here.