Barcodescanner Camera Auto Focus Exception in Android -

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can know why device through exception when camera on following exception through use barcodescanner. works fine after trying auto focus 2 3 times runtimeexception: autofocus failed:

fatal exception: java.lang.runtimeexception: autofocus failed    @ android.hardware.camera.native_autofocus(camera.java)    @ android.hardware.camera.autofocus(camera.java:1126)    @ com.maruticourier.android.zbarscanneractivity$1.run(zbarscanneractivity.java:175)    @ android.os.handler.handlecallback(handler.java:800)    @ android.os.handler.dispatchmessage(handler.java:100)    @ android.os.looper.loop(looper.java:194)    @ android.app.activitythread.main(activitythread.java:5391)    @ java.lang.reflect.method.invokenative(method.java)    @ java.lang.reflect.method.invoke(method.java:525)    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:833)    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:600)    @ dalvik.system.nativestart.main(nativestart.java)


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