android - classnotfoundexception -

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i'm working on app has got face detection in it. i'm using android's facedetector class , 1 of it's methods. i'm getting frame previewframe callback format yuvimage. need bitmap facedetection work. problem when run program there's error saying classnotfoundexception regard yuvimage. i've imported yuvimage class , there's no errors in source file. why can't yuvimage class found?

thanks

if activity or service must , should mention in android manifest file


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