title: Need to downgrade version of pandas but I'm getting a "ModuleNotFoundError" error
body: <p>The error I'm receiving is </p>
  
  <pre><code>ModuleNotFoundError: No module named 'pandas.core.internals.managers'; 
  'pandas.core.internals' is not a package
  </code></pre>
  
  <p>I am trying to downgrade my pandas version to version 0.22.0 after having a newer version installed previously. I read that it is an issue with the pickle file, but I'm not sure what this means. How can I update my pickle file so that I can use pandas 0.22.0 after having a newer version installed previously? I need to downgrade so I can assign multiple axes to an axis.</p>
  
  <p>Thanks!</p>