B4X FEED FaceDetection CameraEx error

[practicalsoft]

Hi
Why does CameraEx have an error when I use startFaceDetection while my device support 5 faces (i check it with getMaxNumDetectedFaces)
In some device, I have no error
If CameraEx have a problem, please introduce alternative library
Thanks

Error occurred on line: 385 (CameraExClass)
java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4j.object.JavaObject.RunMethod(JavaObject.java:131)
at anywheresoftware.b4a.samples.camera.cameraexclass._startfacedetection(cameraexclass.java:272)
at anywheresoftware.b4a.samples.camera.main._camera1_ready(main.java:745)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at...
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