get type error in the example testrender.py

[AZdet]

I am trying to get to know how to use getCameraImage in pyBullet. However when I try to run the demo in examples/pybullet/examples/testrender.py, I get the error above. I get the same error when I try to run testrender_np.py. I have no idea where goes wrong and I can hardly find any useful information on the Internet. Please help!

[AZdet]

I try to visualize the image returned by getCameraImage directly with the code below.

        _, _, rgba_pic, _, _ = p.getCameraImage(800, 600)
        rgba_pic = np.array(rgba_pic, np.uint8).T.reshape((800, 600, 4))
        pic = cv2.cvtColor(rgba_pic, cv2.COLOR_RGBA2BGR)
        cv2.imshow('test', pic)
        cv2.waitKey(0)

However, the result is very werid.

I wonder how to get it right.