Failed assertion: line 24 pos 15: 'initialCameraPosition != null': is not true

Question

I have inserted below library in pubspec.yaml

  google_maps_flutter:
    git:
      url: git://github.com/flutter/plugins
      path: packages/google_maps_flutter

But I get an error every time

Another exception was thrown: 'file:///C:/src/flutter/.pub-cache/git/plugins-aedcc6f81843ae2da3a6ac0c8e8c4b530d1ac035/packages/google_maps_flutter/lib/src/google_map.dart': Failed assertion: line 24 pos 15: 'initialCameraPosition != null': is not true.

Thanks in advance.