This happened to me also, and I resolved it with these steps:
Hope this helps.
This problem arises when you don't have any project on Firebase. You can resolve this issue by following the points below.
Well done. You solved the problem:)
At the time of writing this, Firebase Assistant plugin is incompatible with Android Studio 4.1, so you'll have to connect your project with Firebase manually by creating a new Firebase project and copying over the google-services.json
Once you click on connect to firebase, then you will be redirected to the firebase page. If you already have the project created in the firebase website and want to use the same then simply click on the existing project or else create a new project. Once you are inside that project, you will get a window as Then simply click on connect and your android studio project will be connected with the firebase project.
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