Error occurred in handler for 'sum': Error: No handler registered for 'sum'

I followed [example](https://github.com/egoist/tipc/tree/main/example), as you have configured tipc in project, when im calling `sum.uerQuery()` in home page

```js
import { Button } from '@/components/ui/button'
import { client } from '@/client'

export const Home = () => {
const { data } = client.sum.useQuery({ a: 1, b: 2 })
// console.log(data)

return (

Click

)
}
```

im getting error in terminal `registerIpcMain(router)` I put that everywhere but seems like it ain't working
> Error occurred in handler for 'sum': Error: No handler registered for 'sum'

this is where i setup
```js
app.whenReady().then(() => {
registerIpcMain(router) // here
electronApp.setAppUserModelId('com.electron')
app.on('browser-window-created', (_, window) => {
optimizer.watchWindowShortcuts(window)
})

ipcMain.on("ping", () => console.log("pong")) // this works btw
createWindow()

app.on('activate', function () {
if (BrowserWindow.getAllWindows().length === 0) createWindow()
})
})
```

what am I doing wrong?