Solid Fill Rectangle Error [LineType Parameter?]

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Hi Folks,

When creating shapes with OpenCV, can someone tell me what the "LineType" parameter is? From the definition of the various shapes, it appears that linetype has a default value of 8. What is curious though, is when I use the code below to create a solid fill rectangle, the code produces a run time error whenever I use values of [2,3,5,6,7] for the LineType along with a value of -1 for the thickness (to produce a solid fill rectangle). However, when I change the thickness value to 6 and leave the linetype = 2, the code runs fine. Why is this??

Error: Assertion failed (connectivity == 8 || connectivity == 4) in LineIterator

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

using namespace std;
using namespace cv;

//solid fill rectangle example
    int main()
    {
        Mat image(200, 200, CV_8UC3, Scalar(255,0,0));

        Point start = Point (50,50);
        Point end = Point (150,150);
        int thickness = -1;
        int linetype =2; //error

        rectangle (image, start, end, Scalar(0,255,0), thickness, linetype);

        namedWindow("Image");
        imshow("Image", image);

    waitKey(0);
    }