Error when uploading a knowledge item v2014

Symptoms

When uploading an attachment for a knowledge item, an error message occurs.

Error/warning messages

Server Error in '/' Application.

[ArgumentNullException: Value cannot be null.
Parameter name: value]
   System.Xml.Linq.XText..ctor(String value) +97654
   Changepoint.PresentationServices.RecentAccessed.AddOrUpdate(Page page, Guid resourceId, String entity, Guid entityId, String name, String toolTip) +656
   Changepoint.Enterprise.KnowledgeManagement.dcKMSubmit.Page_Load(Object sender, EventArgs e) +7560
   System.Web.UI.Control.OnLoad(EventArgs e) +92
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772

Resolution

This can happen when the attachment exceeds the maximum size configured for the users global workgroup. Please split the attachment into smaller files or in system management, increase the maximum attachment size for the global workgroup.

Note: A defect request has been logged in order to show a more meaningful error message in this situation.