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I tried to calibrate a camera with an asymmetric circle grid but none of the photos looked like recognized and after 5 or 6 photos running in the window "Image viewer" has appeared the error "OpenCV Error: Bad argument (Unknown array type) in cvarrToMat". Any idea on the problem?

I tried to calibrate a camera with an asymmetric circle grid but none of the photos looked like recognized and after 5 or 6 photos running in the window "Image viewer" has appeared the error "OpenCV Error: Bad argument (Unknown array type) in cvarrToMat". Any idea on the problem?problem? I'm using the .cpp file of "samples" folder of opencv, the defaul.xml file i edited is this <?xml version="1.0"?> <opencv_storage> <Settings> <BoardSize_Width>13</BoardSize_Width> <BoardSize_Height>8</BoardSize_Height> <Square_Size>7</Square_Size> <Calibrate_Pattern>"ASYMMETRIC_CIRCLES_GRID"</Calibrate_Pattern> <Input>"C:/images/CameraCalibration/VID5.xml"</Input> <Input_FlipAroundHorizontalAxis>0</Input_FlipAroundHorizontalAxis> <Input_Delay>1</Input_Delay> <Calibrate_NrOfFrameToUse>25</Calibrate_NrOfFrameToUse> <Calibrate_FixAspectRatio>0</Calibrate_FixAspectRatio> <Calibrate_AssumeZeroTangentialDistortion>0</Calibrate_AssumeZeroTangentialDistortion> <Calibrate_FixPrincipalPointAtTheCenter>0</Calibrate_FixPrincipalPointAtTheCenter> <Write_outputFileName>"out_camera_data.xml"</Write_outputFileName> <Write_DetectedFeaturePoints>1</Write_DetectedFeaturePoints> <Write_extrinsicParameters>1</Write_extrinsicParameters> <Show_UndistortedImage>1</Show_UndistortedImage> </Settings> </opencv_storage>

I tried to calibrate a camera with an asymmetric circle grid but none of the photos looked like recognized and after 5 or 6 photos running in the window "Image viewer" has appeared the error "OpenCV Error: Bad argument (Unknown array type) in cvarrToMat". Any idea on the problem? I'm using the .cpp file of "samples" folder of opencv, opencv downloadable here link text, the defaul.xml file i edited is this <?xml version="1.0"?> <opencv_storage> <Settings> <BoardSize_Width>13</BoardSize_Width> <BoardSize_Height>8</BoardSize_Height> <Square_Size>7</Square_Size> <Calibrate_Pattern>"ASYMMETRIC_CIRCLES_GRID"</Calibrate_Pattern> <Input>"C:/images/CameraCalibration/VID5.xml"</Input> <Input_FlipAroundHorizontalAxis>0</Input_FlipAroundHorizontalAxis> <Input_Delay>1</Input_Delay> <Calibrate_NrOfFrameToUse>25</Calibrate_NrOfFrameToUse> <Calibrate_FixAspectRatio>0</Calibrate_FixAspectRatio> <Calibrate_AssumeZeroTangentialDistortion>0</Calibrate_AssumeZeroTangentialDistortion> <Calibrate_FixPrincipalPointAtTheCenter>0</Calibrate_FixPrincipalPointAtTheCenter> <Write_outputFileName>"out_camera_data.xml"</Write_outputFileName> <Write_DetectedFeaturePoints>1</Write_DetectedFeaturePoints> <Write_extrinsicParameters>1</Write_extrinsicParameters> <Show_UndistortedImage>1</Show_UndistortedImage> </Settings> </opencv_storage>