Android Question AndroidVisionFaceView Error

[PodSoft2016]

Hi guys, I Used This Link For facial-landmarks-from-a-bitmap-photo-using-google-mobile-vision-api . it had an error :

main_activity_create (java line: 352)
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at anywheresoftware.b4a.keywords.LayoutBuilder.loadLayout(LayoutBuilder.java:170)
at anywheresoftware.b4a.objects.ActivityWrapper.LoadLayout(ActivityWrapper.java:209)
at JHS.b4aAndroidVisionPhotoFaceDetector.main._activity_create(main.java:352)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:213)
at JHS.b4aAndroidVisionPhotoFaceDetector.main.afterFirstLayout(main.java:105)
at JHS.b4aAndroidVisionPhotoFaceDetector.main.access$000(main.java:17)
at JHS.b4aAndroidVisionPhotoFaceDetector.main$WaitForLayout.run(main.java:83)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:224)
at android.app.ActivityThread.main(ActivityThread.java:7562)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.objects.CustomViewWrapper.AfterDesignerScript(CustomViewWrapper.java:64)
at anywheresoftware.b4a.keywords.LayoutBuilder.loadLayout(LayoutBuilder.java:162)
... 14 more
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int com.google.android.gms.vision.face.Face.getId()' on a null object reference
at com.google.android.gms.samples.vision.face.photo.FaceView.getId(FaceView.java:187)
at android.view.ForceDarkHelper.updateForceDarkForView(ForceDarkHelper.java:264)
at android.view.View.<init>(View.java:5789)
at android.view.View.<init>(View.java:5196)
at android.view.View.<init>(View.java:5175)
at com.google.android.gms.samples.vision.face.photo.FaceView.<init>(FaceView.java:47)
at photowrapper.photoWrapper._initialize(photoWrapper.java:79)
... 17 more
Can anybody Help me

Tnx alot.