Error when adding db in RTApplication.kt

app/src/main/java/uca/baptistearthur/geocaching/application/RTApplication.kt

@@ -5,13 +5,9 @@ import uca.baptistearthur.geocaching.data.Database
 
 class RTApplication: Application() {
 
-    lateinit var db: Database
+//   val db: Database by lazy {
-
+//       Database.getInstance(this)
-    override fun onCreate() {
+//   }
-        super.onCreate()
-        db = Database.getInstance(applicationContext) as Database
-    }
-
 
 
 }

app/src/main/java/uca/baptistearthur/geocaching/ui/activity/MainWindow.kt

@@ -17,9 +17,9 @@ import uca.baptistearthur.geocaching.viewModels.RoadTripViewModelFactory
 
 class MainWindow: AppCompatActivity() {
 
-    private val roadTripViewModel: RoadTripViewModel by viewModels<RoadTripViewModel> {
+//    private val roadTripViewModel: RoadTripViewModel by viewModels<RoadTripViewModel> {
-        RoadTripViewModelFactory((this.application as RTApplication).db.roadTripDAO())
+//        RoadTripViewModelFactory((this.application as RTApplication).db.roadTripDAO())
-    }
+//    }
 
     @SuppressLint("MissingInflatedId")
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -40,7 +40,6 @@ class MainWindow: AppCompatActivity() {
             true
         }
 
-
     }
 
 }