title: Azure DevOps: Copy files to task failed with "Not found SourceFolder: D:\a\1\s\$(Build.SourceDirectory)"
body: <p>I am building a pipeline in Azure DevOps for Machine Learning.
  I created multiple steps starting from creating workspace, compute target, train and register the model, when I am trying to copy the files I am getting this error.</p>
  <p>The step, I used is:</p>
  <p><a href="https://i.stack.imgur.com/CAEZ5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CAEZ5.png" alt="enter image description here" /></a></p>
  <p>Error I am getting is:</p>
  <p><a href="https://i.stack.imgur.com/pNJlZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pNJlZ.png" alt="enter image description here" /></a></p>