Getting alot of errors when connecting flutter app to firebase

[Brayan603]

Launching lib\main.dart on TECNO BD2d in debug mode...
Running Gradle task 'assembleDebug'...

FAILURE: Build failed with an exception.

• Where:
  Build file 'C:\Users\Brayan Malova\AndroidStudioProjects\untitled4\android\build.gradle' line: 10

• What went wrong:
  A problem occurred evaluating root project 'android'.

Supplied String module notation 'com.google.gms.google-services 4.4.2' is invalid. Example notations: 'org.gradle:gradle-core:2.2', 'org.mockito:mockito-core:1.9.5:javadoc'.

• Try:

Run with --stacktrace option to get the stack trace.
Run with --info or --debug option to get more log output.
Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 3s
Error: Gradle task assembleDebug failed with exit code 1