OpenCVSharp >> Cv.CvtColor Error:Incorrect number of channels for this conversion code

Hey,
i´m new using OpenCvSharp, following many tutorials i´m starting to create my faceRecognition project, but i´m stopped because this damn error on CvtColor.
I´m create all images with the same number of Channels but this error insists on appear.

Here´s the part of code when a use the CvtColor, to convert one image to Gray:

Code (CSharp):

1.  using (IplImage img = Texture2DtoIplImage(finalImage))
2.             using (IplImage smallImg = new IplImage(new CvSize(Cv.Round(img.Width / Scale), Cv.Round(img.Height / Scale)), BitDepth.U8, 1))
3.             {
4.                 using (IplImage gray = new IplImage(img.Size, BitDepth.U8, 1))
5.                 {                
6.                     Cv.CvtColor(img, gray, ColorConversion.BgrToGray);
7.                     Cv.Resize(gray, smallImg, Interpolation.Linear);
8.                     Cv.EqualizeHist(smallImg, smallImg);
9.                 }

and here the code to convert Texture2D to IplImage:

Code (CSharp):

1. IplImage Texture2DtoIplImage(Texture2D texture)
2.     {
3.         IplImage ipl =  new IplImage(new CvSize(CAPTURE_WIDTH, CAPTURE_HEIGHT), BitDepth.U8, 1);
4.         int jBackwards = CAPTURE_HEIGHT;
5.  
6.         for (int v = 0; v < CAPTURE_HEIGHT; ++v)
7.         {
8.             for (int u = 0; u < CAPTURE_WIDTH; ++u)
9.             {
10.  
11.                 CvScalar col = new CvScalar();
12.                 col.Val0 = (double)texture.GetPixel(u, v).b * 255;
13.                 col.Val1 = (double)texture.GetPixel(u, v).g * 255;
14.                 col.Val2 = (double)texture.GetPixel(u, v).r * 255;
15.  
16.                 jBackwards = CAPTURE_HEIGHT - v - 1;
17.  
18.                 ipl.Set2D(jBackwards, u, col);
19.             }
20.         }
21.         return ipl;
22.     }

Thanks for the help.