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The following error occurs: “Session state can only be used when enableSessionState is set to true

The following error occurs: “Session state can only be used when enableSessionState is set to true

The following error is displayed when editing a web part.

The following error occurs: 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 \\ section in the application configuration.

Error using calculated column for a Folder in a document library using Quest Web Parts 5.4.1

Error using calculated column for a Folder in a document library using Quest Web Parts 5.4.1

The problem is with the Folder information for a document library.
For a document library the field Folder is “generated” automatically – and is displayed correctly when it is shown as a normal field or when <%Folder%> is used in the body of the Custom Display – but when you create a calculated field using <%Folder%> it gives an error of “System.Data.DataRowView” instead of the path to the folder in the document library.