Error: ENOENT, buildindex.html not found

I use electron-builder to pack my React electron app. After installing and launching my application I’m getting this error:

Error: ENOENT, build\index.html not found in D:\Test\MyApp\resources\app.asar
at createError (node:electron/js2c/asar_bundle:2:1574)
at Object.lstat (node:electron/js2c/asar_bundle:2:4546)
at node:electron/js2c/asar_bundle:2:4950
at process.processTicksAndRejections (node:internal/process/task_queues:77:11)

(I think) This problem caused by my express server, that streams index.html file.

Code, that starts express server using index.html, builded by npm run build:

const startServer = () => {
    const app = express();
    app.use(express.static(path.join(__dirname, 'build')));

    app.get('/*', function (req, res) {
        res.sendFile(path.join(__dirname, 'build', 'index.html'));
    });

    app.listen(7865);
}

Creating window code:

const createWindow = async () => {
    win = new BrowserWindow({
        width: 1080,
        height: 720,
        minWidth: 1350,
        minHeight: 860,
        title: 'MyApp',
        webPreferences: {
            nodeIntegration: true,
            devTools: true,
            contextIsolation: false,
            enableRemoteModule: true,
        },
    })

    win.removeMenu()
    win.setMenu(null)

    isDev ? null : startServer()
    isDev ? win.loadURL('http://localhost:3000')
        : win.loadURL('http://localhost:7865')

    win.maximize()

    win.webContents.on('before-input-event', (_, input) => {
        if (input.type === 'keyDown' && input.key === 'F12') {
            win.webContents.isDevToolsOpened()
                ? win.webContents.closeDevTools()
                : win.webContents.openDevTools({ mode: 'right' });
        }
    })
}

//const {app, BrowserWindow} = require('electron')
app.whenReady().then(() => {
    createWindow()
})

Build field in package.json:

"build": {
    "productName": "MyApp",
    "appId": "com.test.myapp",
    "extends": null,
    "win": {
      "target": "nsis",
    },
    "nsis": {
      "allowToChangeInstallationDirectory": true,
      "oneClick": false,
    }
  }

directory structure:
https://i.stack.imgur.com/fCxOz.png

I’m sure that problem is in built application. When I use this code in dev mode (with changing isDev -> !isDev) server with index.html works fine, as I expect.

How can it be fixed?