title: Error in build process templates
body: <p>I get these errors in visual studio 2008 web application,</p>
  
  <p><code>Error  13  The tag 'Activity' does not exist in XML namespace 'http://schemas.microsoft.com/netfx/2009/xaml/activities'. Line 1 Position 30.</code></p>
  
  <p>and</p>
  
  <p><code>Error  14  Unknown build error, ''clr-namespace:TfsBuild;' mapping URI is not valid. Line 1 Position 1172.</code></p>
  
  <p>What is the likely issue here? Any help appreciated. Thanks.</p>