1、问题
flutter 项目在 pubspec.yaml 导入 url_launcher 包，然后点击 Pub get 错误提示如下
F:\flutter_sdk\flutter\bin\flutter.bat --no-color pub get
Running "flutter pub get" in flutter_1...
Error on line 25, column 5 of pubspec.yaml: A dependency may only have one source.
26 │ │ url_launcher: ^5.5.0
29 │ │ # The following adds the Cupertino Icons font to your application.
30 │ │ # Use with the CupertinoIcons class for iOS style icons.
31 │ │ cupertino_icons: ^0.1.3
Process finished with exit code 65
2、分析
cupertino_icons 和 url_launcher 关键字没有左对齐
3、解决办法
让 cupertino_icons 和 url_launcher 关键字左对齐，然后再点击 Pub get 更新包就行
