java - The followinf error of unrecognized or unsupported array type in CvMat *cvGetMat(const CvArr *, CvMat *, int *, int), -

public class mainactivity extends appcompatactivity {     static {         system.loadlibrary("opencv_java");         system.loadlibrary("nonfree");     }     private imageview imageview;     private bitmap inputimage;       @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         inputimage = bitmapfactory.decoderesource(getresources(), r.drawable.test);         setcontentview(r.layout.activity_main);         imageview = (imageview) this.findviewbyid(r.id.imageview);         sift();     }      @override     public void onresume() {         super.onresume();     }      public void sift() {         mat rgba = new mat();         utils.bitmaptomat(inputimage, rgba);          mat outputimg = new mat();         imgproc.cvtcolor(rgba, rgba, imgproc.color_rgba2rgb);         imgproc.cvtcolor(rgba, outputimg, imgproc.color_rgb2hsv);          mat news =new mat();          mat rgb = new mat(rgba.size(),cvtype.cv_8sc3);         scalar lower_green =new scalar(45, 50,20);         scalar upper_green =new scalar(95,255,255);         core.inrange(outputimg, lower_green, upper_green,news);          imgproc.cvtcolor(news, news, imgproc.color_gray2rgb);       //morphological operations         mat bground = new mat();         mat fground = new mat();         imgproc.erode(news, fground, imgproc.getstructuringelement(imgproc.morph_rect, new size(55,55*3)));         imgproc.dilate(news, bground, imgproc.getstructuringelement(imgproc.morph_rect, new size(55, 55*3)));          mat mark =new mat(); //marker watershed algorithm         mat markerimage =new mat(mark.size(),cvtype.cv_32s);           core.add(fground,bground,mark);         markerimage.convertto(mark, cv_32s);         rgb.convertto(rgba, cv_8s);         int markdepth =rgb.depth();         int rgbdepth =rgb.depth();         int markchannel =markerimage.channels();         int rgbchannel =rgba.channels();          if (markerimage.depth() == cv_32s ){             system.out.println("depth32 = " + markdepth);         }         if (rgb.depth() == cv_8s ){             system.out.println("depth8 = " + rgbdepth);         }          system.out.println("markchannel = " + markchannel);         system.out.println("rgbachannel = " + rgbchannel);          imgproc.watershed(rgb,markerimage);         utils.mattobitmap(mark, inputimage);         imageview.setimagebitmap(inputimage);     }     // code working leaf image identification , comparison }  

the code supposed compare , identify leaf image using watershed algorithm. error generated is:

opencv error: bad flag (parameter or structure field) (unrecognized or unsupported array type) in cvmat *cvgetmat(const cvarr *, cvmat *, int *, int), file /hdd2/buildbot/slaves/slave_ardbeg1/50-sdk/opencv/modules/core/src/array.cpp