title: Issue using Black formatter in PyCharm
body: <p>I am trying to setup the formatter "<strong>black</strong>" to work with PyCharm. I have tried setting it up with both the standard External Tools preferences and using the Files Watcher Plugin. Neither has worked for me. </p>
  
  <p><strong>I am getting these errors:</strong></p>
  
  <p><a href="https://i.stack.imgur.com/wbu6y.png" rel="noreferrer"><img src="https://i.stack.imgur.com/wbu6y.png" alt="PyCharm Errors in the run console"></a></p>
  
  <p>I have it installed in <code>/Users/Scott/Library/Python/3.8/lib/python/site-packages/black.py</code> and want it to run globally for all Python project files when I save.</p>
  
  <p><strong>This is how my preferences look:</strong></p>
  
  <p><a href="https://i.stack.imgur.com/Tg42c.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Tg42c.png" alt="PyCharm External Tools configuration for the black formatter"></a></p>
  
  <p>I am new to Python and PyCharm and Stack Overflow for that matter, and am stilling setting this up. I appreciate your help.</p>