Python OpenCV Stereo Camera Calibration Array Error: TypeError: imagePoints1 data type = 17 is not supported

I'm working on a gaze correction project, with a stereo camera setup. For my designed algorithm I need to have the cameras calibrated and the images rectified. I also want to do this in real time. There is an error I get whilst trying to use cv2.stereoCalibrate method, I've searched extensively and have read the official documentation, but none of it managed to help me, even after reworking my code a few times.

Here it is:

import cv2
import numpy as np
import Camera

def calibrate(camera1, camera2):
    if(isinstance(camera1, Camera.Camera) & isinstance(camera2, Camera.Camera)):
        pass
    else:
        raise ValueError( "Wrong input types. Expecting: <Camera>, <Camera> \n Got: <" + 
                      str(camera1.__class__) +'>, <' + str(camera2.__class__) +'>.\n')  
    #instantiate Real-world object point matrix
    objPoints = np.zeros(((9*6), 3), np.int32)
    objPoints[:,:2] = np.mgrid[0:9,0:6].T.reshape(-1,2)

    #Chessboard pattern dimesntions
    dims = (9, 6)

    #2 arrays to store 3D and 2D object points
    objPArray = []
    imgPArrayr = []
    imgPArrayl = []

    #some useful matrices
    R = [] # rotation matrix 
    T = [] # translation vector beterwwn coordinate systems
    E = [] # essential matrix
    F = [] #fundamental matrix
    Q = [] #disparity to depth mapping matrix

    criteria = (cv2.TERM_CRITERIA_MAX_ITER + cv2.TERM_CRITERIA_EPS,
                100, 1e-5)
    flags = (cv2.CALIB_FIX_ASPECT_RATIO + cv2.CALIB_ZERO_TANGENT_DIST +
             cv2.CALIB_SAME_FOCAL_LENGTH + cv2.CALIB_FIX_INTRINSIC)

    ret,imgr  = camera1.read()
    ret,imgl  = camera2.read()

    #Converting to greyscale, as OpenCV requires it for calibration
    grey_imgr = cv2.cvtColor(imgr, cv2.COLOR_BGRA2GRAY)
    grey_imgl = cv2.cvtColor(imgl, cv2.COLOR_BGRA2GRAY)


    ret, cornersr =cv2.findChessboardCorners(grey_imgr,dims)
    cv2.drawChessboardCorners(grey_imgr, dims,cornersr,0)

    ret, cornersl =cv2.findChessboardCorners(grey_imgl,dims)
    cv2.drawChessboardCorners(grey_imgl, dims, cornersl,0)

    cv2.imshow("chessboard", grey_imgr)
    cv2.imshow("chessboard1", grey_imgl)

    imgPArrayl.append(cornersl)
    imgPArrayr.append(cornersr)
    objPArray.append(objPoints)
    '''
    cv2.imwrite("./test_images/img_r"+str(i)+".jpg",imgr)
    cv2.imwrite("./test_images/img_l"+str(i)+".jpg",imgl)
    i+=1
    '''

    objPArray = [np.asarray(x) for x in objPArray]
    imgPArrayl = [np.asarray(x) for x in imgPArrayl]
    imgPArrayr = [np.asarray(x) for x in imgPArrayr]

    print imgPArrayl
    print imgPArrayr

    retvalCalib, cameraMatrixl, distCoeffsl, cameraMatrixr, distCoeffsr, R, T, E, F =\
        cv2.stereoCalibrate(objPArray,
                            imgPArrayl,
                            imgPArrayr,
                            (9*6),
                            None,
                            None,
                            None,
                            None,
                            (640,480),
                            criteria,
                            flags)

    return retvalCalib, cameraMatrixl, distCoeffsl, cameraMatrixr, distCoeffsr, R, T, E, F

The Error I get is: TypeError: imagePoints1 data type = 17 is not supported

What do I do?

Recompiling OpenCV3 from source and reinstalling it removes this problem.