Debug error with cvFitEllipse2

I'm trying to aproximate red pixels from a image to a ellipse.
when i build, i take succesful build, but when i start the debug a
fatal error appear in my screen. I think that my method of work to
cvPoint or   
cvFitEllipse2 is not correct.

//source code:
void callback(IplImage* image){ 

        IplImage* image1 = image;
        int i,j;
        int x,y;
        int numpunts=0;
        CvPoint* PointArray;
        PointArray = (CvPoint*)malloc( 100000*sizeof(CvPoint) );

        for(i=0; i<image1->height; i+=1){

                for(j=(image1->widthStep)*i;
j<(image1->widthStep)*(i+1);j+=image1->nChannels){

                        r=(unsigned char)image1->imageData[j+2];
                        g=(unsigned char)image1->imageData[j+1];
                        b=(unsigned char)image1->imageData[j];

                        if ((r > 210) && (r< 2500)  && (b > 70 ) && (b < 100) 
&& (g>100) &&
(g<130) ){

                                y=j/3;
                                x=i;
                                PointArray[numpunts].x=x;
                                PointArray[numpunts].y=y;
                                numpunts++;
                        }                       
                } 
        }

        cvFitEllipse2( PointArray );
        free(PointArray);

}


Any idea???
Thanks a lot









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