matching one template with multiple object with opencv and java for android

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i tried to do a code that find all objects using a template .The logCat don't give me any errors but the application stopped this is the code .Please help me

public Mat matchTemplate(String inFile, String templateFile,String outFile, int match_method) {
Log.i(TAG, "Running Template Matching");

Mat img = Imgcodecs.imread(inFile);

Mat templ = Imgcodecs.imread(templateFile);




// / Create the result matrix
int result_cols = img.cols() - templ.cols() + 1;
int result_rows = img.rows() - templ.rows() + 1;
Mat result = new Mat(result_rows, result_cols, CvType.CV_32FC1);
Log.i(TAG,"error debug: "+result.empty());

       // / Do the Matching Normalize and Perform the template matching operation
      Imgproc.matchTemplate(img, templ, result, match_method);
    //   Core.normalize(result, result, 0, 1, Core.NORM_MINMAX, -1, new Mat());
 Imgproc.threshold(result, result,0.8,1,Imgproc.THRESH_TOZERO);    

         // / Localizing the best match with minMaxLoc. We localize the minimum and maximum values in the result matrix R by using minMaxLoc.
 Point matchLoc;
 Point maxLoc;
 Point minLoc;

 MinMaxLocResult mmr;

 boolean iterate = true;
      while(true){

 // / Localizing the best match with minMaxLoc
 mmr = Core.minMaxLoc(result);
 matchLoc = mmr.maxLoc;


        if(mmr.maxVal >=0.9)
     {
   //  iterate = false;




      // / Show me what you got

      Imgproc.rectangle(img, matchLoc, new Point(matchLoc.x + templ.cols(),matchLoc.y + templ.rows()), new    Scalar(0,0,0));
 }
  else
     break; //No more results within tolerance, break search
     }
// Save the visualized detection.
Log.i(TAG, "Writing: " + outFile);

Imgcodecs.imwrite(outFile, img);
return img;

}