Mr.Z issues

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                                            Mr.Z

java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.drawable.Drawable android.graphics.drawable.Drawable.mutate()' on a null object reference

![image](https://user-images.githubusercontent.com/9284096/59588438-2a844700-911a-11e9-8e76-f65a6016c38f.png) 奇酷 360 N5 系统android 6.0.1

文件PlateDetection.cpp报错，请教

Error:(30) undefined reference to 'cv::CascadeClassifier::detectMultiScale(cv::_InputArray const&, std::__ndk1::vector&, double, int, int, cv::Size_, cv::Size_)'