# 当前Dart SDK版本不满足约束：因为your_project依赖于package_a ^2.0.0，该包需要SDK版本>=3.5.0 <4.0.0，但当前SDK为3.4.0

- **ID:** `flutter/sdk-constraint-violation`
- **领域:** flutter
- **类别:** build_error
- **验证级别:** ai_generated
- **修复率:** 85%

## 根因

某个依赖项需要的Dart SDK版本高于项目pubspec.yaml中配置的或本地安装的版本。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| Flutter 3.22 | active | — | — |
| Dart 3.4.0 | active | — | — |
| Dart 3.5.0 | active | — | — |

## 解决方案

1. ```
   Upgrade the Dart SDK: run 'flutter upgrade' to get the latest Flutter which includes a higher Dart SDK, or download a newer Dart SDK manually and update the PATH.
   ```
2. ```
   Downgrade the problematic package to a version that supports your current SDK. Check pub.dev for older versions and update pubspec.yaml: 'package_a: ^1.9.0'.
   ```
3. ```
   Use dependency_overrides in pubspec.yaml to force a version that works, but be aware of potential issues: dependency_overrides: package_a: ^1.9.0
   ```

## 无效尝试

- **** — Older versions may have the same SDK constraint or introduce other incompatibilities. (70% 失败率)
- **** — pubspec.lock is auto-generated and will be overwritten on next 'pub get'. (95% 失败率)
- **** — This doesn't upgrade the actual Dart SDK; the local SDK remains at 3.4.0. (90% 失败率)