Vite | Could not resolve entry module (chroootwww/index.html)

I have problem. At command line I do npm run build and result is:

ondrej@vostro-ov:/mnt/web_x1/aou511/chrootwww$ npm run build

> vue@0.0.0 build
> vite build

vite v3.1.0 building for production...
✓ 0 modules transformed.
Could not resolve entry module (chroootwww/index.html).
error during build:
Error: Could not resolve entry module (chroootwww/index.html).
    at error (file:///mnt/web_x1/aou511/chrootwww/node_modules/rollup/dist/es/shared/rollup.js:1858:30)
    at ModuleLoader.loadEntryModule (file:///mnt/web_x1/aou511/chrootwww/node_modules/rollup/dist/es/shared/rollup.js:22369:20)
    at async Promise.all (index 0)

File vite.config.js is:

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [vue()],
  resolve: {
    alias: {
      '@': fileURLToPath(new URL('./src', import.meta.url))
    }
  }, 
  root: 'chroootwww/',
  build: {
    sourcemap: true,
    outDir: 'www/dist', 
  },
})

File index.html exist

Does anyone know what the problem is, please? Thanks for your reply :-)