Npm run vercel:dev failed due to python config?

Help
1

here is my config

{
  "version": 2,
  "devCommand": "npm run dev",
  "functions": {
    "api/index.py": {
      "runtime": "vercel-python@3.9"
    }
  },
  "routes": [
    {
      "src": "/api/(.*)",
      "dest": "/api/index.py"
    },
    {
      "src": "/(.*)",
      "dest": "/index.html"
    }
  ]
}

expect successfully run

npm run vercel:dev


> vue-project@0.0.0 vercel:dev
> vercel dev

Vercel CLI 44.2.7
Error: Function Runtimes must have a valid version, for example `now-php@1.0.0`.

source code: GitHub - dotku/tso-vue-project at bug-vercel-config