Server Error in '/' Application.

Server Error in '/' Application.--------------------------------------------------------------------------------Object reference not set to an instance of an object. 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.NullReferenceException: Object reference not set to an instance of an object.Source Error: Line 16: Line 17: Line 18: Line 19: Line 20: Source File: F:\Forum.Web.Deploy\Controls\Discussion\WideReplica.ascx Line: 18 Stack Trace: [NullReferenceException: Object reference not set to an instance of an object.] Forum.MessengerStatusCache.IsUserOnline(Int32 userId, Boolean& isAgentUser) in c:\inetpub\wwwroot\forum.web\messengerstatuscache.cs:216 Forum.Controls.Discussion.WideReplica.BindReplica(Object Text, Object Signature, Object Blocked) in c:\inetpub\wwwroot\Forum.Web\Controls\Discussion\WideReplica.ascx.cs:115 ASP.WideReplica_ascx.__DataBind__control5(Object sender, EventArgs e) in F:\Forum.Web.Deploy\Controls\Discussion\WideReplica.ascx:18 System.Web.UI.Control.OnDataBinding(EventArgs e) +66 System.Web.UI.Control.DataBind() +26 System.Web.UI.Control.DataBind() +86 System.Web.UI.Control.DataBind() +86 System.Web.UI.WebControls.Repeater.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem) +127 System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource) +475 System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e) +48 System.Web.UI.WebControls.Repeater.DataBind() +23 System.Web.UI.Control.DataBind() +86 System.Web.UI.Control.DataBind() +86 System.Web.UI.Control.DataBind() +86 Forum.Core.Generic.OnPreRender(EventArgs e) in c:\inetpub\wwwroot\Forum.Web\Core\Generic.cs:431 System.Web.UI.Control.PreRenderRecursiveInternal() +62 System.Web.UI.Page.ProcessRequestMain() +1545 --------------------------------------------------------------------------------Version Information: Microsoft .NET Framework Version:1.1.4322.2300; ASP.NET Version:1.1.4322.2300