Saving navigator fragment after turning phone

[ladiesman2127]

Hi, sadly i've got a problem, when i'm turining phone app crashes because EpubNavigatorFragment is internal. I'm creating fragmentfactory in ViewModel and returning it to NavHost to fragment manager. What should i do to save this instance of EpubFragment?

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mypackage.app.MainActivity}: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment org.readium.r2.navigator.epub.EpubNavigatorFragment: could not find Fragment constructor
Caused by: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment org.readium.r2.navigator.epub.EpubNavigatorFragment: could not find Fragment constructor
Caused by: java.lang.NoSuchMethodException: org.readium.r2.navigator.epub.EpubNavigatorFragment.<init> []

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            Theme {
                App(supportFragmentManager)
            }
        }
    }
}

NavHost(
        navController = navController,
        startDestination = Screens.ReadScreen.name,
    ) {

        composable(route = ReaderScreen) {
            val navigatorFragmentTag = stringResource(R.string.epub_navigator_tag)
            ReaderScreen(
                modifier = modifier.fillMaxSize(),
                viewModel = readViewModel,
                navigateUp = { navController.navigateUp() },
                onFailedToOpen = {
                    navController.popBackStack()
                },
                replaceWithCommit = { containerId, factory ->
                    fragmentManager.fragmentFactory = factory
                    fragmentManager.beginTransaction()
                        .add(
                            containerId,
                            EpubNavigatorFragment::class.java,
                            Bundle(),
                            navigatorFragmentTag
                        )
                        .commit()
                },
            )
        }
    }

View Model

@OptIn(ExperimentalReadiumApi::class)
    suspend fun initState() {
        val publication = getPublication()
        val navigatorFactory = EpubNavigatorFactory(publication!!)
        val navigatorEditor =
            navigatorFactory.createPreferencesEditor(
                EpubPreferences(
                    theme = Theme.DARK,
                    lineHeight = 12.0
                )
            )
        val fragmentFactory = navigatorFactory
            .createFragmentFactory(
                null,
                listener = NavigatorListener(),
                paginationListener = PaginationListener(),
                initialPreferences = navigatorEditor.preferences
            )
        _uiState.value = ReaderUiState(navigatorEditor, fragmentFactory)
    }

PLEASE HELP ME, SIR @mickael-menu

[franklin-deasis-alctech]

@ladiesman2127 Every figured this out?