AzureDevOps/VSTS Build - Could not find version number data in BUILD_BUILDNUMBER
<p>Setting up a simple class library to build and publish to VSTS's own feed, I see this error when the NuGet package runs.</p>

<blockquote>
  <p>Could not find version number data in BUILD_BUILDNUMBER</p>
</blockquote>

<p>I have the "Use Build number to version package" option ticked. Expected VSTS to just work.</p>