standard local deviation in android

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hi, i have implented local standard deviation in android and i got this error.

10-30 21:23:27.999: E/cv::error()(8900): OpenCV Error: Assertion failed (src.dims == 2 && info.height == (uint32_t)src.rows && info.width == (uint32_t)src.cols) in void Java_org_opencv_android_Utils_nMatToBitmap2(JNIEnv, jclass, jlong, jobject, jboolean), file /home/reports/ci/slave_desktop/50-SDK/opencv/modules/java/generator/src/cpp/utils.cpp, line 97 10-30 21:23:28.009: E/org.opencv.android.Utils(8900): nMatToBitmap catched cv::Exception: /home/reports/ci/slave_desktop/50-SDK/opencv/modules/java/generator/src/cpp/utils.cpp:97: error: (-215) src.dims == 2 && info.height == (uint32_t)src.rows && info.width == (uint32_t)src.cols in function void Java_org_opencv_android_Utils_nMatToBitmap2(JNIEnv, jclass, jlong, jobject, jboolean) 10-30 21:23:28.009: W/dalvikvm(8900): threadid=1: thread exiting with uncaught exception (group=0x41bb3798) 10-30 21:23:28.009: E/AndroidRuntime(8900): FATAL EXCEPTION: main 10-30 21:23:28.009: E/AndroidRuntime(8900): CvException [org.opencv.core.CvException: /home/reports/ci/slave_desktop/50-SDK/opencv/modules/java/generator/src/cpp/utils.cpp:97: error: (-215) src.dims == 2 && info.height == (uint32_t)src.rows && info.width == (uint32_t)src.cols in function void Java_org_opencv_android_Utils_nMatToBitmap2(JNIEnv*, jclass, jlong, jobject, jboolean)

and here is the code:-

    Imgproc.cvtColor(rgb, gry, Imgproc.COLOR_RGB2GRAY);

    int rows = gry.rows(); int cols = gry.cols();
    rows--; cols--;
    Toast.makeText(getApplicationContext(),"rows =" + rows+cols,Toast.LENGTH_LONG).show();

    Mat tmp = new Mat(rows+2, cols+2, gry.type());
    Imgproc.copyMakeBorder(tmp, tmp, 1, 1, 1, 1, 1);
    rows = tmp.rows();cols=tmp.cols();
    rows = rows-1;cols = cols-1;

    for(int i=2;i<rows-2;i++)
    {
        for(int j=2;j<cols-2;j++)
        {
            int sum1=0;
            int sum2=0;
            block = tmp.rowRange(i-2,i+3).colRange(j-2,j+3);

            sum1 = (int) Core.sumElems(block).val[0];
            sum2 = (int) Core.sumElems(block.mul(block)).val[0];

            int mean = sum1/25;
            int variance = -(mean*mean -(sum2/25));
            int deviation = (int) Math.sqrt(variance);

            tmp .put(i-2, j-2, deviation);
        }
    }

    Bitmap scale = Bitmap.createBitmap(gry.cols(), gry.rows(), Bitmap.Config.ARGB_8888);

I am not able to get the output, i think there is some matrix related error.I hope you understand what I'm asking , Thanks for any suggestion . android opencv