Cannot read property 'slice' of undefined

[yungblud]

Hello, I am trying to run granite app from template in dev mode.
I followed this step and extracted zip file.
Also I dragged and dropped .app file to my simulator.

It was installed fine. But when I try to load bundle I got this error.

2025-09-12.9.03.31.mov

error log in dev server

ERROR  TypeError: Cannot read property 'slice' of undefined

This error is located at:
    in Router (created by AppRoot)
    in BackEventProvider (created by AppRoot)
    in RNCSafeAreaProvider (created by SafeAreaProvider)
    in SafeAreaProvider (created by AppRoot)
    in AppStateProvider (created by VisibilityProvider)
    in VisibilityChangedProvider (created by VisibilityProvider)
    in VisibilityProvider (created by App)
    in App (created by AppRoot)
    in InitialPropsProvider (created by AppRoot)
    in AppRoot (created by Root)
    in Root (created by component)
    in component
    in RCTView (created by View)
    in View (created by AppContainer)
    in RCTView (created by View)
    in View (created by AppContainer)
    in AppContainer
    in shared(RootComponent), js engine: hermes

And also, I wonder is there any other way to run granite app directly? (with XCode or Android Studio)

[yungblud]

I think I found the solution.

I needed to add "granite" to initialScheme in _app.tsx file.

export default Granite.registerApp(AppContainer, {
  appName: 'my-granite-app',
  context,
  initialScheme: 'granite', // this one needs to be added
});

[yungblud]

And, one more issue!

I could load bundle successfully.
But when I change something and saved pages/about.tsx file, hot-module reloaded. And I've always got this error.

[yungblud]

I think the above issue will be resolved by this PR #117

[yungblud]

I think the main issue of registerApp's initialScheme is from this.

import { getSchemeUri } from '@granite-js/react-native';

console.log('getSchemeUri()', getSchemeUri()); // getSchemeUri() value is undefined

I guess this .app file for the testing app has not been fully compiled with GraniteModule native module?

I couldn't find the GraniteModule native files like .mm in the codebase. So hopefully my issue would be helpful!
Thanks.