OpenCV Error: One of arguments' values is out of range (dp, min_dist, canny_threshold and acc_threshold must be all positive numbers) in cvHoughCircles, file /build/buildd/opencv-2.4.5+dfsg/modules/imgproc/src/hough.cpp, line 1031
terminate called after throwing an instance of 'cv::Exception'
what(): /build/buildd/opencv-2.4.5+dfsg/modules/imgproc/src/hough.cpp:1031: error: (-211) dp, min_dist, canny_threshold and acc_threshold must be all positive numbers in function cvHoughCircles