Flutter – Firebase Plugin [id: 'com.google.gms.google-services', version: '4.4.0', apply: false] was not found

1.Add Firebase to Your Flutter Project:
Make sure you have added Firebase to your Flutter project by following these steps:
Go to the Firebase Console (https://console.firebase.google.com/).
Create a new project or select an existing one.
Add your app to the Firebase project by clicking "Add app" and select the appropriate platform (Android).
Follow the setup instructions, which will involve downloading a
google-services.json file.
Place this file in the android/app directory of your Flutter project.

2.Configure build.gradle Files:
Update the build.gradle files in your Flutter project as follows:

In your project-level build.gradle (usually located in android/build.gradle), make sure you have the Google Services classpath:

    // ...
    classpath 'com.android.tools.build:gradle:7.2.1' // or the latest version
}```

n your app-level build.gradle (usually located in android/app/build.gradle), add the following at the bottom of the file:
```apply plugin: 'com.google.gms.google-services'```
then after make these changes
run ```flutter pub get ```
and Double-check your dependencies in the `pubspec.yaml `
```dependencies:
  firebase_core: ^latest_version
  firebase_auth: ^latest_version
  firebase_database: ^latest_version
  firebase_messaging: ^latest_version```


3.Check google-services.json:
Ensure that the google-services.json file in your android/app directory is correctly configured for your Firebase project.

4.Clean and Rebuild:
Sometimes, issues can be resolved by cleaning and rebuilding the project. In Android Studio, you can find these options in the "Build" menu.