how to run firstapp flutter 1.5 - flutter

Question

i tryed testdrive for flutter installed on windows as here https://flutter.dev/docs/get-started/test-drive
defaut application generated work, well, but when i try to follow the snd part at
https://flutter.dev/docs/get-started/codelab
i get errors:
error: The function 'MyApp' isn't defined. (undefined_function at [flutter_app007] lib\main.dart:3)
error: 'MaterialApp' isn't a function. (invocation_of_non_function at [flutter_app007] lib\main.dart:8)
error: 'Scaffold' isn't a function. (invocation_of_non_function at [flutter_app007] lib\main.dart:10)
error: 'AppBar' isn't a function. (invocation_of_non_function at [flutter_app007] lib\main.dart:11)
for this code in main.dart
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Welcome to Flutter',
home: Scaffold(
appBar: AppBar(
title: const Text('Welcome to Flutter'),
),
body: const Center(
child: const Text('Hello World'),
),
),
);
}
}
i checked flutter doctor, but show nothing bad.. any idea?

Answer 1

go to the project directory and open windows cmd. and try flutter run

Answer 2

ok, i finally resolved the problem.
when i was typed 'flutter_console.bat', i was get after, 'mysql is unknow program '. i finally founded that an install of MySQL Fabric 1.5 & MySQL Utilities 1.5\ setted his path in PATH env variable. this path poisonned result path integration , returning 'mysql is unknow program' and stopping project generation.. . desinstalling the mysql software solved the problem by cleaning path from his entry and now, the project can be created and work as expected..
very strange, no..?