AcadPoint my_pt1 = default(AcadPoint);
AcadPoint my_pt2 = default(AcadPoint);
my_pt1 = AcadApp.ActiveDocument.Utility.GetPoint(, "Please click on the first point :"); // I get error at this line
my_pt2 = AcadApp.ActiveDocument.Utility.GetPoint(my_pt1, "Please click on the second point :");
// I get error at this line