title: Fix "The attribute publisher.itemtype has an invalid value" when author is publisher
body: <p>How to fix "The attribute publisher.itemtype has an invalid value" when author is also publisher?</p>
  
  <p>Generaly I have an client who want hi-rate SEO website and he writte, print, sell and publish own books. Google not approve my setup and return me error in Schema.</p>
  
  <p><strong>UPDATE</strong></p>
  
  <p>Here is example of my problem <a href="https://i.stack.imgur.com/So7IJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/So7IJ.png" alt="enter image description here"></a>
  I place <code>publisher</code> like "John Di Lemme Development Group". I do this via HTML codes, not use JSON LD for this.</p>