Server Error in '/' Application.

Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive. Please also make sure that System.Web.SessionStateModule or a custom session state module is included in the <configuration>\<system.web>\<httpModules> section in the application configuration.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive. Please also make sure that System.Web.SessionStateModule or a custom session state module is included in the <configuration>\<system.web>\<httpModules> section in the application configuration.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[HttpException (0x80004005): Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive. Please also make sure that System.Web.SessionStateModule or a custom session state module is included in the <configuration>\<system.web>\<httpModules> section in the application configuration.]
   System.Web.UI.Page.get_Session() +179
   Fleetcare.Web.Custom.Webparts.RetainCampaignData.RetainCampaignTags() in D:\a\1\s\src\Fleetcare.Web\Custom\Webparts\RetainCampaignData.ascx.cs:52
   Fleetcare.Web.Custom.Webparts.RetainCampaignData.Page_Load(Object sender, EventArgs e) in D:\a\1\s\src\Fleetcare.Web\Custom\Webparts\RetainCampaignData.ascx.cs:23
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   CMS.Base.Web.UI.AbstractUserControl.OnLoad(EventArgs e) +71
   CMS.PortalEngine.Web.UI.CMSAbstractWebPart.OnLoad(EventArgs e) +211
   System.Web.UI.Control.LoadRecursive() +154
   System.Web.UI.Control.LoadRecursive() +251
   System.Web.UI.Control.LoadRecursive() +251
   System.Web.UI.Control.LoadRecursive() +251
   System.Web.UI.Control.LoadRecursive() +251
   System.Web.UI.Control.LoadRecursive() +251
   System.Web.UI.Control.LoadRecursive() +251
   System.Web.UI.Control.LoadRecursive() +251
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4082


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4690.0