title: when i import library as a module in android studio, i came across red at Class
body: <p><a href="https://i.stack.imgur.com/TN2B7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TN2B7.png" alt="enter image description here"></a></p>
  
  <p>I imported library as a module in Android studio.
  But, I can't use this library.
  how should I do?</p>