title: NuGet Packing a Nuspec: Value cannot be null or empty string. Parameter name: value
body: <p>I'm packaging up a bunch of javascript for a website.  Here's what my <code>.nuspec</code> looks like.</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;
  &lt;package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd"&gt;
    &lt;metadata&gt;
      &lt;version&gt;$version$&lt;/version&gt;
      &lt;authors&gt;Author Person&lt;/authors&gt;
      &lt;owners&gt;Company Name&lt;/owners&gt;
      &lt;id&gt;PackageNameId&lt;/id&gt;
      &lt;title&gt;PackageNameId&lt;/title&gt;
      &lt;requireLicenseAcceptance&gt;false&lt;/requireLicenseAcceptance&gt;
      &lt;description&gt;Description text stuff&lt;/description&gt;
      &lt;copyright&gt;Company Copyright Info&lt;/copyright&gt;
    &lt;/metadata&gt;
    &lt;files&gt;
      &lt;file src="www\**" target="" /&gt;  &lt;!--It just packages everything in the www folder in the same directory as this .nuspec --&gt;
    &lt;/files&gt;
  &lt;/package&gt;
  </code></pre>
  
  <p>It just packages everything in that www folder.  The <code>$version$</code> token should be getting replaced by the NugetPackage version flag in TFS (what I'm building in).</p>
  
  <p>I don't see anything called <code>value</code>, so I'm really at a loss for why it's throwing an error.</p>
  
  <p>Here's the full error:</p>
  
  <pre><code>Attempting to build package from 'PackageName.nuspec'.
  
  ##[error]Value cannot be null or an empty string.
  
  ##[error]Parameter name: value
  </code></pre>