bad notification for startforeground 3a java lang runtimeexception 3a invalid

1@Override
2public void onCreate(){
3    super.onCreate();
4    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
5        startMyOwnForeground();
6    else
7        startForeground(1, new Notification());
8}
9
10private void startMyOwnForeground(){
11    String NOTIFICATION_CHANNEL_ID = "com.example.simpleapp";
12    String channelName = "My Background Service";
13    NotificationChannel chan = new NotificationChannel(NOTIFICATION_CHANNEL_ID, channelName, NotificationManager.IMPORTANCE_NONE);
14    chan.setLightColor(Color.BLUE);
15    chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
16    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
17    assert manager != null;
18    manager.createNotificationChannel(chan);
19
20    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
21    Notification notification = notificationBuilder.setOngoing(true)
22            .setSmallIcon(R.drawable.icon_1)
23            .setContentTitle("App is running in background")
24            .setPriority(NotificationManager.IMPORTANCE_MIN)
25            .setCategory(Notification.CATEGORY_SERVICE)
26            .build();
27    startForeground(2, notification);
28}