title: TF unable to determine workspace
body: <p>I get this error:</p>
  
  <pre><code> Unable to determine the workspace. You may be able to correct this by running 'tf workspaces /collection:TeamProjectCollectionUrl'.
  </code></pre>
  
  <p>I have checkout the workspace from Jenkins plugin (TFS-plugin). Then I run a MSBuild script where I want to checkout a file with this target:</p>
  
  <pre><code> &lt;!-- Checkout before building --&gt;
   &lt;Target Name="CheckoutUpdateVersion"&gt;
      &lt;Message Text="***** Checkout $(UpdateVersionFile) *****" /&gt;
      &lt;Exec WorkingDirectory="E:\WS\Jenkins\workspace\TD_-_Build_TFS\" Command="$(tf)  checkout E:\WS\Jenkins\workspace\TD_-_Build_TFS\src\rubin\Scripts\update_version.sql" /&gt;       
  &lt;/Target&gt;
  </code></pre>
  
  <p>I have checked so my workspace I mapped and it is mapped to the WorkingDirectory that is above.</p>