Windows 10与代码1.56.2
I'm using flutter 1.22.
I'm trying to upgrade flutter 2.2.0 [√] Flutter (Channel dev, 2.3.0-12.1.pre, on Microsoft Windows [Version 10.0.19042.985], locale ru-RU)
• Flutter version 2.3.0-12.1.pre at D:\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision f9c825981c (2 days ago), 2021-05-18 14:07:52 -0700
• Engine revision 26e217e6c3
• Dart version 2.14.0 (build 2.14.0-edge.a527411e5100a0a4f48c4009087a1b988aa784af)
Target of URI doesn't exist: 'package:flutter/material.dart'.
Try creating the file referenced by the URI, or Try using a URI for a file that does exist.

我尝试的内容:
flutter pub get
flutter pub upgrade
flutter clean重新启动vs代码
哭喊:d
更换频道和升级删除vs代码中的插件,并重新安装重启PC
发布于 2021-05-21 20:22:41
name: test
description: test client.
version: 4.0.703
environment:
sdk: '>=2.13.0 <3.0.0'
dependencies:
flutter:
sdk: flutter
rxdart: ^0.24.1
flutter_local_notifications_platform_interface: ^2.0.0
timezone: ^0.6.1
flutter_launcher_icons: ^0.8.1
shared_preferences: ^0.5.12+2
json_annotation: ^3.1.0
http: ^0.12.2
firebase_core: "^0.5.2"
firebase_messaging: "^8.0.0-dev.8"
date_range_picker: ^1.0.6
flutter_datetime_picker: ^1.4.0
video_player: ^0.10.12+5
url_launcher:
chewie: ^0.9.10
flutter_local_notifications: ^4.0.1+2
permission_handler: ^5.0.1+1
device_info: ^1.0.0
path_provider: ^1.6.24
wakelock: ^0.1.2
sip_ua:
path: ../modules/dart-sip-ua-master
image_picker:
flutter_icons:
ios: true
android: true
image_path_ios: "assets/launcher/icon.png"
image_path_android: "assets/launcher/icon.png"
adaptive_icon_background: "assets/launcher/background.png"
adaptive_icon_foreground: "assets/launcher/foreground.png"
dev_dependencies:
build_runner:
json_serializable: ^3.5.0
mockito: ^4.1.1
plugin_platform_interface: ^1.0.1
flutter_test:
sdk: flutter
flutter:
uses-material-design: true
assets:
- images/logo.png
- images/cctvback.pnghttps://stackoverflow.com/questions/67632478
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