Error in kitti_util.py

[hadarsh7798]

I am getting the following error:
File "kitti_object.py", line 274, in
dataset_viz()
File "kitti_object.py", line 264, in dataset_viz
show_image_with_boxes(img, objects, calib, True)
File "kitti_object.py", line 154, in show_image_with_boxes
img2 = utils.draw_projected_box3d(img2, box3d_pts_2d)
File "/content/frustum-pointnets/kitti/kitti_util.py", line 380, in draw_projected_box3d
qs = qs.astype(np.int32)
AttributeError: 'NoneType' object has no attribute 'astype'

Please help me out