title: Microsoft Test Manager 2010 Error: The required category 'Microsoft.TestCaseCategory' does not exist in team project
body: <p>When I'm attempting to open any of our projects in TFS 2010 with Microsoft Test Manager 2010, I get the error: <strong>The required category 'Microsoft.TestCaseCategory' does not exist for project XXXXXXX</strong>.</p>
  
  <p>What is the reason for this error, and what steps can I take to resolve it?</p>
  
  <p><em>Also, is stackoverflow the right forum for this question? I feel like it's not really a programming question, but it didn't seem to have an obvious home to me</em></p>