title: When using dask local, I get "ERROR - Workers don't have promised key"
body: <p>I have a jumper notebook configured to use the dask local distributed scheduler</p>
  
  <pre class="lang-py prettyprint-override"><code>#Start Dask
  client = Client(
      n_workers=6, 
      threads_per_worker=4,
      memory_limit='8GB',
      processes=True, 
  )
  
  client
  </code></pre>
  
  <p>When I start using a dask dataframe I get red error output that contains <code>ERROR - Workers don't have promised key</code> searching for this error leads to help with remote clusters.</p>
  
  <p>What is wrong/going on?</p>