title: Team Build Error: The Path ... is already mapped to workspace
body: <p>When creating a new build in Team Foundation Server, I get the following error when attempting to run the new build:</p>
  
  <blockquote>
    <p>The path
    C:\Build\ProductReleases\FullBuildv5.4.2x\Sources
    is already mapped to workspace
    BuildServer_23.</p>
  </blockquote>
  
  <p>I am unable to see a workspace by that name in the workspaces dialog.</p>