title: Android Studio : cannot find symbol variable
body: <p>This is my <code>login.xml</code>. </p>
  
  <p><a href="https://i.stack.imgur.com/ycMSF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ycMSF.png" alt="enter image description here"></a></p>
  
  <p>This is my java file. There are no red marks in my java file, but it is showing error while compiling.</p>
  
  <p><a href="https://i.stack.imgur.com/RpeGI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RpeGI.png" alt="enter image description here"></a></p>
  
  <p>In the following lines. </p>
  
  <pre><code>textButton = (Button) findViewById(R.id.TextButton);
  fingerprintButton = (Button) findViewById(R.id.FingerprintButton);
  </code></pre>
  
  <p>I keep getting this error:</p>
  
  <blockquote>
    <p>Error:(52, 48) error: cannot find symbol variable TextButton</p>
    
    <p>Error:(53, 55) error: cannot find symbol variable FingerprintButton</p>
  </blockquote>
  
  <p>I have declared these vairables and included the in <code>string.xml</code> as well. I am new to android studio. Please help me.</p>