Error Caught in Page_Error event

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Error in: http://welcomeaboardtravelpa.com/welcomeaboardtravelpa/PageEvent.aspx?aspxerrorpath=/welcomeaboardtravelpa/WebResource.axd
Error Message: Using themed css files requires a header control on the page. (e.g. ).
Stack Trace:
at System.Web.UI.PageTheme.SetStyleSheet() at System.Web.UI.Page.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)