# RuntimeError: Uvicorn 工作进程启动失败

- **ID:** `python/fastapi-runtimeerror-uvicorn-worker-failed-to-start`
- **领域:** python
- **类别:** system_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

Uvicorn 在启动过程中遇到错误，通常是由于缺少依赖项或应用程序导入不正确。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 3.x | active | — | — |

## 解决方案

1. **Ensure correct module path and app instance.** (95% 成功率)
   ```
   uvicorn myapp:app --reload
   ```
2. **Check that all dependencies are installed.** (90% 成功率)
   ```
   pip install -r requirements.txt
   ```

## 无效尝试

- **Reinstalling uvicorn without checking Python version.** — Uvicorn requires Python 3.7+; older versions may cause startup failure. (60% 失败率)
- **Using wrong module path in uvicorn command.** — If the module path is incorrect, uvicorn cannot find the application. (80% 失败率)