title: Android Studio: Cannot find symbol class
body: <p>i am a newbie in making android apps in using android studio. i am doing the qr code make using zxing. i follow the website to do the steps which like adding the module and dependencies. However now i got these kind of errors. Can somebody help me in fixing it? thanks a lot.</p>
  
  <p><strong>coding part</strong>
  <a href="https://i.stack.imgur.com/7XyjG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7XyjG.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/pmA7t.jpg" rel="nofollow noreferrer">message part</a></p>