Android : Android Studio - Cannot resolve symbol 'firebase'

Android : Android Studio - Cannot resolve symbol 'firebase'
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As I promised, I have a secret feature to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
Then, type the letters 'awesome' on your keyboard as the next step.
Your YouTube progress bar will transform into a flashing rainbow.

Let me give you a brief introduction of who I am,
Hey, I am Delphi.
I can provide you with assistance to help you answer your questions.
Android : Android Studio - Cannot resolve symbol 'firebase'
I am available to answer your more specific queries, so feel free to comment or start a chat.
Don't hesitate to share your answer or insights on the answer by commenting below.
Providing an answer will be acknowledged and appreciated with a 'heart' from me.
: 'firebase' resolve symbol Android Studio - Android Cannot