flutter run 失败，错误为“无法解析‘package:characters/characters.dart’中的包‘characters’。”

Question

颤振运行命令

输出 Could not resolve the package 'characters' in 'package:characters/characters.dart'.

扑医生

[?] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[?] Chrome - develop for the web
[?] Android Studio (version 4.0)
[?] VS Code (version 1.47.2)
[?] Connected device (3 available)

Answer 1

我今天在将 Flutter 更新到现有项目的 Flutter Channel beta 1.20.0-7.2.pre 时也遇到了这个错误。如https://github.com/flutter/flutter/issues/59645#issuecomment-645236663 中所述运行：flutter clean解决了问题。这实际上删除.dart_tool了一些其他文件。

Answer 2

我解决了安装https://pub.dev/packages/characters的问题

Answer 3

It could just be an issue with flutter's cache.

Run flutter clean to clear your cache.

Answer 4

我今天遇到了这个错误（当我更新到Flutter 1.20.0-7.2.pre • channel beta 时），最后我通过删除项目中的.dart_tool(location :)../yourProject/.dart_tool文件夹并再次运行我的项目来解决它。