[InvalidOperationException: L'utilisation de Menu.IncludeStyleBlock nécessite Page.Header pour être non null (par exemple, <head runat="server" />).]
System.Web.UI.WebControls.MenuRendererStandards.PreRender(Boolean registerScript) +1691499
System.Web.UI.WebControls.Menu.OnPreRender(EventArgs e) +307
System.Web.UI.Control.PreRenderRecursiveInternal() +132
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3671
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