升级从当前版本到最新版本的错误

Question

通过运行flutter升级后，我从当前版本升级到我的工作室终端内的最新版本后出现以下错误。

The current Dart SDK version is 2.1.0-dev.0.0.flutter-be6309690f.

Because no versions of uri match >0.11.3 <0.12.0 and uri >=0.7.1 <0.11.3 requires SDK version >=0.8.10 <2.0.0 or >=2.0.0-dev.18 <2.0.0, uri >=0.7.1 <0.11.3-∞ or >0.11.3 <0.12.0 is forbidden.
And because uri 0.11.3 depends on quiver >=0.17.0 <0.30.0 and every version of flutter_test from sdk depends on quiver 2.0.0+1, flutter_test from sdk is incompatible with uri >=0.7.1 <0.12.0.
And because map_view 0.0.14 depends on uri ^0.11.1 and no versions of map_view match >0.0.14 <0.1.0, flutter_test from sdk is incompatible with map_view ^0.0.14.
So, because maskn depends on both map_view ^0.0.14 and flutter_test any from sdk, version solving failed.
pub get failed (1)

我该如何解决这个问题？有什么方法可以从最新版本降级到我的旧版本？

Answer 1

将此添加到pubpsec.yaml应该可以解决，直到发布支持Dart 2.0.0的uri版本

dependency_overrides:
  quiver: ^2.0.0+1

Answer 2

这个thread on github与你的问题密切相关。

基本上你必须寻找有问题的插件的.pubspec.yaml并以这种方式编辑它：

environment:
   sdk: ">=2.0.0-dev.58.0 <3.0.0"

如果这有用，请告诉我。