title: error: expected color but got (raw string) color/gray
body: <p>I have switched to android studio 3. after many problem that I fixed, I got this error:</p>
  
  <p>color/colorPrimary but i go this error:Error:(87, 5) error: expected color but got (raw string) color/gray</p>
  
  <p><a href="https://i.stack.imgur.com/DOUpU.png" rel="noreferrer"><img src="https://i.stack.imgur.com/DOUpU.png" alt="enter image description here"></a></p>