Error: Not found: 'dart:ui' when running Flutter Template App-CodePudding

I just got started with Dart/Flutter and my goal is to execute the default flutter app template generated with the flutter --create command in VS Code

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter  ;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

But whenever I try to run it, I get this series of errors from several files in the Material library and I can't find out what is causing them or how to solve them.

: Error: Not found: 'dart:ui'
../…/material/animated_icons.dart:9
import 'dart:ui' as ui show Paint, Path, Canvas;
       ^
: Error: Not found: 'dart:ui'
../…/material/animated_icons.dart:10
import 'dart:ui' show lerpDouble;
       ^
: Error: Not found: 'dart:ui'
../…/material/app.dart:5
import 'dart:ui' as ui;
       ^
: Error: Not found: 'dart:ui'
../…/material/app_bar_theme.dart:5
import 'dart:ui' show lerpDouble;
       ^
: Error: Not found: 'dart:ui'
../…/material/arc.dart:6
import 'dart:ui' show lerpDouble;
       ^
: Error: Not found: 'dart:ui'
../…/material/bottom_app_bar_theme.dart:5
import 'dart:ui' show lerpDouble;
       ^
: Error: Not found: 'dart:ui'
../…/material/bottom_navigation_bar_theme.dart:5
import 'dart:ui' show lerpDouble;
       ^
: Error: Not found: 'dart:ui'
../…/material/bottom_sheet.dart:5
import 'dart:ui' show lerpDouble;
       ^
: Error: Not found: 'dart:ui'
../…/material/bottom_sheet_theme.dart:5
import 'dart:ui' show lerpDouble;
       ^
: Error: Not found: 'dart:ui'
../…/material/button_bar_theme.dart:5
import 'dart:ui' show lerpDouble;
       ^

Running plain Dart projects like the one created with dart create -t console-full dart_application_1 --force: running works fine.

Can anyone tell me what causes this error?

CodePudding user response：

Are you using flutter run in terminal or you are using your ide for running main.dart file. first try flutter run --debug or use your ide with the flutter icon not the simple one for running main function .

CodePudding user response：

Make sure you are in the correct directory or file and not the parent folder.