MaskImageFast Error

[soopamanluva]

Hello. there is an error I can't overcome for quite some time now.
ERROR OpenCvSharp.OpenCVException: 'scn == m.cols || scn + 1 == m.cols' ERROR
when i try to calculate DVH

in SliceContourMeta MaskImageFast method
using (var pointMat = new Mat(new[] { ContourPoints.Count }, points.ToArray()))
{
var inerse = txMatrix.Inv();
var txPointMat = pointMat.Transform(txMatrix.Inv()); <------ error happens here
txPointMat.GetArray(out allPoints);
}
Thanks in advance for help.
Best regards