calibrateCamera fails even using vector<Mat> for rvecs, tvecs

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I am getting an error when I try to run calibrateCamera.

The error is this:

C:\builds\2_4_PackSlave-win32-vc11-shared\opencv\modules\core\src\matrix.cpp:963: error: (-215) i < 0 in function cv::_InputArray::getMat

I have read elsewhere that this can happen when passing Mat's instead of std::vectors of Mat's as the rvecs and tvecs, but that is what I am doing! So why do I still get this error? The error only occurs when I try to run calibrateCamera, all the other code executes without errors.

Here is my code:

       cv::Size patternSize(9,6);
       vector<cv::Point2f> imagePoints;
       bool found = cv::findChessboardCorners(mat, patternSize, imagePoints, CV_CALIB_CB_ADAPTIVE_THRESH + CV_CALIB_CB_FAST_CHECK);


        if ( found )
        {
            if ( pMainWinDlg->getCamImage() )
            {
                drawChessboardCorners(cv::Mat(pMainWinDlg->getCamImage()), patternSize, cv::Mat(imagePoints), found);
            }


            float squareSize = 1.f;
            vector<cv::Point3f> objectPoints;
            objectPoints = Create3DChessboardCorners(patternSize, squareSize);

            vector<cv::Mat> rotationVectors;
            vector<cv::Mat> translationVectors;

            cv::Mat distortionCoefficients = cv::Mat::zeros(8, 1, CV_64F); // There are 8 distortion coefficients
            cv::Mat cameraMatrix = cv::Mat::eye(3, 3, CV_64F);

            cv::Size imageSize = mat.size();

            int flags = 0;
            try
            {
                double rms = cv::calibrateCamera(objectPoints, imagePoints, imageSize, cameraMatrix, distortionCoefficients, rotationVectors, translationVectors, flags|CV_CALIB_FIX_K4|CV_CALIB_FIX_K5 );
            }