title: ModuleNotFoundError: No module named 'app.model'
body: <p>I just tried to <code>import app.model.preprocessor</code> and it gave me the following error:</p>
  
  <blockquote>
    <p>ModuleNotFoundError: No module named 'app.model'</p>
  </blockquote>
  
  <p>I am using code from a tutorial. Does anyone know why my computer doesn't want to import <code>app.model</code>? I did install app with pip3.</p>
  
  <p><img src="https://i.stack.imgur.com/6Fiwe.png" alt="import and error"></p>