ZC300 Barcode Print Error

Hello, I have some problem with LINK-OS SDK: I can't print Barcodes!

The others elements (Image, Text, Shape) were printed, but when I try to print a Barcode it print my method parameters (DrawBarcode) on the card!

IMG_20190417_164232.jpg

This is my C# code (taked from GitHub - Zebra/LinkOS-PCCard-Samples at ConnectAndPrint_ZXPSeries1and3_C#  and GitHub - Zebra/LinkOS-PCCard-Samples at CenterBarcode_ZXPSeries3_C# ):

            int errValue;   // value of 0 indicates no errors

            msg = string.Empty;

            try

            {

                if (InitGraphics(_asciiEncoder.GetBytes(drvName), out errValue) == 0)

                {

                    msg = "Printing InitGraphics Error code: " + errValue.ToString();

                    return;

                }

                int rotation = 0; // origin lower left and no rotation

                int barcodeType = 0; // Code 39

                int barcodeWidthRatio = 2; // narrow bar = 2 dots, wide bar = 5 dots

                int barcodeMultiplier = 2; // {2..9}

                int barcodeHeight = 75; // 75 dots

                int textUnder = 1; // true

                string barcodeData = "123456789";

                //To calculate the full length of a Code 39 bar code:

                //L = [(C+2) (3R + 7) - 1] X Where

                //L = Length of bar code

                //C = Number of characters

                //R = Ratio of wide-to-narrow bars

                //X = Number of dots times 0.0033 inches per dot (0.08847 mm per dot); for the 5:2 ratio, X = Dots times 2

                //See ZXP3 SDK Manual for the forumulas used to calcuate the length of other barcode types.

                // Calculate the length of the barcode

                int C = barcodeData.Length;

                double R = 5.0 / 2.0;

                int X = 2;

                int length = (int)((C + 2) * (3 * R + 7) - 1) * X;

                int startX = (int)Math.Floor((CARD_WIDTH - length) / 2.0); //Center barcode horizontally

                int startY = (int)Math.Floor(((CARD_HEIGHT - barcodeHeight) / 2.0) + barcodeHeight); //Center barcode vertically

                // Sends Barcode data to the Monochrome Buffer

                if (DrawBarcode(startX, startY, rotation, barcodeType, barcodeWidthRatio, barcodeMultiplier, barcodeHeight, textUnder, _asciiEncoder.GetBytes(barcodeData), out errValue) == 0)

                {

                    msg = "Printing DrawBarcode Error: " + errValue.ToString();

                    return;

                }

               // Prints the Graphics Buffer (Front Side)

                if (PrintGraphics(out errValue) == 0)

                {

                    msg = "Printing PrintGraphics Error code: " + errValue.ToString();

                    return;

                }

            }

            catch (Exception ex)

            {

                msg += "PrintJob threw exception " + ex.ToString();

            }

            finally

            {

                // Starts the printing process and releases the Graphics Buffer

                if (CloseGraphics(out errValue) == 0)

                {

                    msg = "Printing CloseGraphics Error: " + errValue.ToString();

                }

            }

Please help!