title: Getting PDF_VALIDATION_FAILED exception when trying to create envelopne in DocuSign sample recipe code
body: <p>I am trying to run the code available on <a href="https://github.com/docusign/docusign-csharp-client/blob/master/test/Recipes/CoreRecipes.cs" rel="nofollow">GitHub</a>. </p>
  
  <p>Issue is when I am trying to create an envelope I am getting an exception saying <code>"PDF_VALIDATION_FAILED"</code>.</p>
  
  <p>Can anyone help me out with this issue?</p>