title: Yii2 Class dektrium\user\Module does not exist
body: <p>I have designed Yii2 powered blog by creating models, views and controllers but when I integrate user registration as explained in this tutorial <a href="https://code.tutsplus.com/tutorials/how-to-program-with-yii2-integrating-user-registration--cms-22974" rel="nofollow noreferrer">https://code.tutsplus.com/tutorials/how-to-program-with-yii2-integrating-user-registration--cms-22974</a>  I get: </p>
  
  <blockquote>
    <p>Class dektrium\user\Module does not exist</p>
  </blockquote>
  
  <p>I fail to solve this error anyone who can direct me, please.</p>