Dart 颤振包失败

当我试图添加

firebase\u auth

，并运行

flatter-packages-get

时，我发现以下错误

Running "flutter packages get" in demo...
demo firebase_auth has no versions that match >=0.2.3 <0.3.0 derived from:
- demo depends on version ^0.2.3

---

这个对我来说很好。
我刚刚更改了

flatter

依赖项。
如果这对您不起作用，那么您的颤振设置可能存在问题

name: full3
description: A new Flutter project.

dependencies:
  flutter:
    sdk: flutter
  google_sign_in: "^0.3.1"
  firebase_auth: "^0.2.3"

# For information on the generic Dart part of this file, see the
# following page: https://www.dartlang.org/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:
  fonts:
        - family: Encode Sans
          fonts:
          - asset: assets/fonts/EncodeSansExpanded-Light.ttf

  assets:
  - assets/img/facebook.png
  - assets/img/google.png
  - assets/img/logo.png
  - assets/img/signup.png

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the Icons class.
  uses-material-design: true

---

众所周知，

pub-get

或

flatter-packages-get

返回的错误消息没有多大帮助。有改进的计划，但这需要更广泛的尝试，需要一些时间。这只是意味着，您的某些依赖项约束会阻止您找到一组相互兼容的依赖项版本。您可以尝试启用详细输出以获得mote insight，或者删除大多数依赖项，直到

flatter包获得成功，然后逐个添加它们，直到失败，以查看是哪一个导致冲突。你也可以试试，我不知道它是否支持颤振，但在其他情况下，它通常对这种情况很有帮助。我也在新项目上尝试过，没有希望发布你的pubspec。yamlI已经更新了帖子，请在可以的时候检查。我认为没有特殊的重新安装过程。您可以删除包含它的目录，然后重新安装
name: full3
description: A new Flutter project.

dependencies:
  flutter:
    sdk: flutter
  google_sign_in: "^0.3.1"
  firebase_auth: "^0.2.3"

# For information on the generic Dart part of this file, see the
# following page: https://www.dartlang.org/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:
  fonts:
        - family: Encode Sans
          fonts:
          - asset: assets/fonts/EncodeSansExpanded-Light.ttf

  assets:
  - assets/img/facebook.png
  - assets/img/google.png
  - assets/img/logo.png
  - assets/img/signup.png

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the Icons class.
  uses-material-design: true