OpenCV cvSmooth memory exception

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C++

OpenCV

exceptions

I am trying to do the examples in the OpenCV book and I got to the part regarding cvSmooth. I am trying to use it, but I keep getting a memory exception error of

Unhandled exception at 0x757dd36f in smoothing.exe: Microsoft C++ exception: cv::Exception at memory location 0x0036f6d4..

I have also looked at another post that was similar to this question, but it did not help for me as I got the same error each time. Any help is greatly appreciated and the source code for the function is located below.

#include "stdafx.h"
#include <cv.h>
#include <highgui.h>
#include "iostream"

using namespace std;

void smoothing(IplImage *image)
{
	//create some window to show the input and output image
	cvNamedWindow("smoothing-in");

	cvNamedWindow("smoothing-out");

	//window that show our input image
	cvShowImage("smoothing-in",image);

	//create an image to hold smoothed output
	IplImage *output = cvCreateImage(
		cvGetSize(image),
		IPL_DEPTH_8U,
		3
		);
	//do the smoothing
	cvSmooth(image,output,CV_GAUSSIAN,3,3);

	//show the smoothed image
	cvShowImage("smoothing:",output);

	cvReleaseImage(&output);
	cvWaitKey(0);
	cvDestroyWindow("smoothing-in");
	cvDestroyWindow("smoothing-out");
}
int _tmain(int argc, _TCHAR* argv[])
{
	IplImage *img = NULL;//cvLoadImage("image.jpg");
	if((img = cvLoadImage("image.jpg")) == 0){
		cout<<"image load failed";
	}
	smoothing(img);
	cvReleaseImage(&img);
	return 0;
}
thank !