Session variable trouble

[fatjackC#]

the code line below run fine in our developement and test enviornment but fails in our production environment We do not see any differences in the web.config in any of these environments.

Session["description"] = description;

Turning on the the trace in production enviornment tells nothing more than what I've pasted below. Any suggestions ?

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Error executing child request for orderdetail.aspx.
at System.Web.HttpServerUtility.ExecuteInternal(String path, TextWriter writer, Boolean preserveForm)
at System.Web.HttpServerUtility.Transfer(String path, Boolean preserveForm)
at System.Web.HttpServerUtility.Transfer(String path)
at WWT.MSApps.OrderTracker.Index.ShowOrder_Command(Object sender, DataGridCommandEventArgs e)
at System.Web.UI.WebControls.DataGrid.OnItemCommand(DataGridCommandEventArgs e)
at System.Web.UI.WebControls.DataGrid.OnBubbleEvent(Object source, EventArgs e)
at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
at System.Web.UI.WebControls.DataGridItem.OnBubbleEvent(Object source, EventArgs e)
at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
at System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain()