title: RASA chatbot rasa.core.policies.ensemble.InvalidPolicyConfig: Module for policy ‘MemoizationPolicy’ could not be loaded
body: <p>I’ve got this error, just following the <a href="https://rasa.com/docs/getting-started/#getting-started-with-rasa" rel="nofollow noreferrer">« Getting Started with Rasa »</a> tutorial</p>
  
  <p>So I’ve typed:</p>
  
  <p><code>sudo pip3 install rasa-x --extra-index-url https://pypi.rasa.com/simple</code></p>
  
  <p>which seems to work fine but when I’ve typed:</p>
  
  <p><code>sudo rasa init</code></p>
  
  <p>I’ve got a lot of errors among them:</p>
  
  <p><code>rasa.core.policies.ensemble.InvalidPolicyConfig: Module for policy ‘MemoizationPolicy’ could not be loaded. Please make sure the name is a valid policy.</code></p>