A little late , But if somone else face similar issue.

Make sure Koin is initialized correctly in Application class: also add Logger to see the cause of error

class MyApp : Application() {
    override fun onCreate() {
        super.onCreate()
        startKoin {
             androidLogger(Level.ERROR) // Or Level.DEBUG
            androidContext(this@MyApp) // Important
            modules(appModule)
        }
    }
}

Use androidApplication() inside a Koin module {}:

val appModule = module {
    single {
        Room.databaseBuilder(
            androidApplication(),  // safe only if Koin is started properly, 
            AppDatabase::class.java,
            "wizards"
        ).build()
    }
}

Check manifest: Ensure your Application class is set correctly:

<application
    android:name=".MyApp"
    ...

if the error still persist , try with get()

val appModule = module {
    single {
        Room.databaseBuilder(
            get(),    // gets Context from Koin's DI container
            AppDatabase::class.java,
            "wizards"
        ).build()
    }
}