I am getting errors in Navigator.push(context,), I read in the docs that I the class to be in a material app and that is also not working. any help is appriciated

These are the top lvl classes:

class DashboardScreen extends StatefulWidget {
DashboardScreen({Key key}) : super(key: key);
u/override
_DashboardScreen createState() => _DashboardScreen();
}
class _DashboardScreen extends State<DashboardScreen> {
WeightProvider weightProvider = WeightProvider();
List<Weight> allWeightRecords = List<Weight>();
WorkoutsProvider workoutsProvider = WorkoutsProvider();
List<Workout> allWorkouts = List<Workout>();
final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();

​

***context errors here**