title: Invalid package version for a dependency
body: <p>I am using NuPack (<a href="https://www.nuget.org/packages/NuPack/" rel="nofollow noreferrer">https://www.nuget.org/packages/NuPack/</a>) to create a Nuget automatically on build but when I go to upload my Nuget file, it gives me this error:
  <code>Invalid package version for a dependency with id 'Newtonsoft.Json' in package 'Float.1.0.0': ''</code>.</p>
  
  <ol>
  <li>What is the error telling me?</li>
  <li>How do I fix the issue?</li>
  </ol>