我正在学习颤振的开发，想用光滑的圆形滑块制作一个界面当我按照在我的flutter项目中添加它的指示进行操作时；pub get"；。你能帮我吗？错误消息：
The current Dart SDK version is 2.9.1.
Because circular_slider requires SDK version 2.12.0, version solving failed.
pub get failed (1; Because circular_slider requires SDK version 2.12.0, version solving failed.)
Process finished with exit code 1
这是我的YAML文件
name: circular_slider
description: A new Flutter project.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
version: 1.0.0+1
environment:
sdk: ">=2.12.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
sleek_circular_slider: ^2.0.1
cupertino_icons: ^0.1.3
dev_dependencies:
flutter_test:
sdk: flutter
flutter:
uses-material-design: true
没关系，我从Android Studio卸载了Flutter和Dart，然后重新安装了它们，我下载并提取了最后一个版本的Flutter，然后替换c:\Flutter目录，现在一切都好了