Web.config gotcha

I haven't paid attention to the space in the namespace attribute value and had to spin my wills till found it:

<pages maintainScrollPositionOnPostBack="true">
  <controls>
    <add tagPrefix="Tempo" assembly="Tempo.Web.3.0.1" 
            namespace="Tempo.Web.UI.WebControls "/>

Moral - be accurate with web.config