<kotlin.UninitializedPropertyAccessException: late...

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kotlin.UninitializedPropertyAccessException: lateinit property database has not been initialized
i have read example to create mvvm kotlin from kotlin-mvvm-sample. and try to make an app to read data from exits sqlite
This is MyApp.kt

class MyApp: Application() {
override fun onCreate() {
super.onCreate()
MyApp.database = Room.databaseBuilder(this, DanhMucThuocDatabase::class.java, "TuDienThuoc.db")
.openHelperFactory(AssetSQLiteOpenHelperFactory())...