python system_error ai_generated true

RuntimeError: Uvicorn worker failed to start

ID: python/fastapi-runtimeerror-uvicorn-worker-failed-to-start

Also available as: JSON · Markdown · 中文
80%Fix Rate
83%Confidence
0Evidence
2024-10-12First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Uvicorn encountered an error during startup, often due to missing dependencies or incorrect application import.

generic

中文

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。

Workarounds

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

Dead Ends

Common approaches that don't work:

  1. Reinstalling uvicorn without checking Python version. 60% fail

    Uvicorn requires Python 3.7+; older versions may cause startup failure.

  2. Using wrong module path in uvicorn command. 80% fail

    If the module path is incorrect, uvicorn cannot find the application.