title: Red lines in Android Studio with Firebase
body: <p>I am trying to connect Android Studio with Firebase and I have some red lines and I don't know why. I am following instruction from this tutorial : <a href="https://www.youtube.com/watch?v=tOn5HsQPhUY" rel="nofollow noreferrer">https://www.youtube.com/watch?v=tOn5HsQPhUY</a> </p>
  
  <p>Could someone please tell me if I am doing something wrong and what? </p>
  
  <p>Here is a picture of this </p>
  
  <p><img src="https://i.stack.imgur.com/NQ44C.jpg" alt="link image"></p>