Olá , quando executo o projeto exibe vários erros, o ambiente desenvolvimento é pop os(ubuntu) o flutter e dart a mesma versão do curso:
../../../../../flutter/packages/flutter/lib/src/widgets/routes.dart:345:55: Error: A value of type 'Animation?' can't be assigned to a variable of type 'Animation' because 'Animation?' is nullable and 'Animation' isn't.
- 'Animation' is from 'package:flutter/src/animation/animation.dart' ('../../../../../flutter/packages/flutter/lib/src/animation/animation.dart'). final Animation nextTrain = nextRoute._animation; ^
../../../../../flutter/packages/flutter/lib/src/widgets/routes.dart:1097:48: Error: The argument type 'Animation?' can't be assigned to the parameter type 'Animation' because 'Animation?' is nullable and 'Animation' isn't.
- 'Animation' is from 'package:flutter/src/animation/animation.dart' ('../../../../../flutter/packages/flutter/lib/src/animation/animation.dart'). widget.route.animation, ^
../../../../../flutter/packages/flutter/lib/src/widgets/routes.dart:1098:48: Error: The argument type 'Animation?' can't be assigned to the parameter type 'Animation' because 'Animation?' is nullable and 'Animation' isn't.
- 'Animation' is from 'package:flutter/src/animation/animation.dart' ('../../../../../flutter/packages/flutter/lib/src/animation/animation.dart'). widget.route.secondaryAnimation,.........
