Android Question Barcode scanner Log error

As per Erel Suggestion,I have check tried Camera Barcode scanner from below link.its working fine in Mobile Phone (Samsung J7) but reading of data in Barcode is very slow and also I have check in Tablet device (samsung GT-N5100) but its shows an log error.Please check this and advise the same.....

https://www.b4x.com/android/forum/threads/barcode-reader-based-on-google-play-services-vision.89705/


Logger connected to: samsung GT-N5100
--------- beginning of /dev/log/main
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
Is detector operational: true
** Activity (main) Resume **
findCamera
null
2
facing: 0, 0
java.lang.reflect.InvocationTargetException
success = false, (RuntimeException) java.lang.RuntimeException: Fail to connect to camera service
cameraexclass_iszoomsupported (java line: 598)
java.lang.NoSuchMethodException: isZoomSupported []
at java.lang.Class.getConstructorOrMethod(Class.java:472)
at java.lang.Class.getDeclaredMethod(Class.java:640)
at anywheresoftware.b4a.agraham.reflection.Reflection.runmethod(Reflection.java:214)
at anywheresoftware.b4a.agraham.reflection.Reflection.RunMethod(Reflection.java:802)
at anywheresoftware.b4a.samples.camera.cameraexclass._iszoomsupported(cameraexclass.java:598)
at anywheresoftware.b4a.samples.camera.main._seekbar1_valuechanged(main.java:738)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:186)
at anywheresoftware.b4a.BA$1.run(BA.java:325)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5487)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
--------- beginning of /dev/log/system
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
Is detector operational: true
** Activity (main) Resume **
findCamera
null
2
facing: 0, 0
java.lang.reflect.InvocationTargetException
success = false, (RuntimeException) java.lang.RuntimeException: Fail to connect to camera service
** Activity (main) Pause, UserClosed = true **