我拥有最新版本的Flutter，并且我正在尝试运行官方的Flutter Gallery应用。当我这样做dart --version，我得到
Dart VM version: 2.2.0 (Tue Feb 26 15:04:32 2019 +0100) on "macos_x64"
但是，当我尝试获取软件包时：
[flutter_gallery] flutter packages get
Running "flutter packages get" in flutter_gallery...
The current Dart SDK version is 2.1.2-dev.0.0.flutter-0a7dcf17eb.
Because flutter_gallery requires SDK version >=2.2.0 <3.0.0, version solving failed.
pub get failed (1)
exit code 1
有趣的是，当我运行flutter upgrade它时，它列出了较旧版本的Dart（工具）。
Upgrading Flutter from /Users/leejohnson/dev/flutter...
From https://github.com/flutter/flutter
a1bee54fd..59ce7d6bf dev -> origin/dev
55a2ee588..f8f2b043e master -> origin/master
* [new tag] v1.3.13 -> v1.3.13
Already up to date. …