Error Caught in Page_Error event

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Error in: http://midsummer.jlbpresentations.co.uk/PageEvent.aspx?aspxerrorpath=/ScriptResource.axd

Error Message: Value cannot be null.

Stack Trace:
at ASP.pageevent_aspx.Page_Load(Object sender, EventArgs e) in c:\inetpub\vhosts\jlbpresentations.co.uk\subdomains\midsummer\httpdocs\PageEvent.aspx:line 7 at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)