title: "Error MSB4057 missing target pack" when building .netstandard nuget package
body: <p>I'm trying to create a .netstandard nuget package following <a href="https://docs.nuget.org/ndocs/guides/create-net-standard-packages-vs2017" rel="noreferrer">these instructions</a>, using VS2017 RC. It builds fine, but when I try to create the package using </p>
  
  <pre><code>msbuild /t:pack /p:Configuration=Release
  </code></pre>
  
  <p>I get an error, that the target <em>pack</em> is not available in my solution:</p>
  
  <blockquote>
    <p>error MSB4057: The target "pack" does not exist in the project.</p>
  </blockquote>
  
  <p>I'm not really sure what to do with this message or where I should be looking to fix it. Any suggestions?</p>