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goodFeaturesToTrack crashing or producing one dimensional vector

I am trying to implement optical flow in Vs2008 using opencv2.4.11 I use the following code:

 Mat img = imread("t.JPeG", CV_LOAD_IMAGE_UNCHANGED);//read the image data  
vector<Point2f> corn;
 goodFeaturesToTrack(img,corn,100,0.01,0.01);

I get an error when I run the code and it crashes it says due to opencv_core2411d.dll

when I modify the code to:

 Mat corn instead of  vector<Point2f> corn;

the code runs however, it produces the corn vector 100 rows by 1 column i.e. there is no xy it is only x I assume is that normal? how to infer the coordinates of the features then?