Page Error

Error occured
Error Message: Object reference not set to an instance of an object.

Stack Trace:
System.NullReferenceException: Object reference not set to an instance of an object.
at Backbone.Site.Controls.User.Updates.Page_Load(Object sender, EventArgs e) in D:\VSS\CMS\CMSNet3.5\Site\Controls\User\user_Updates.ascx.cs:line 28
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Internal Error:
Value cannot be null. Parameter name: value