what can i do for this mistake:
File "ContourNet/maskrcnn_benchmark/data/datasets/evaluation/word/word_eval.py", line 470, in prepare_for_boundary_segmentation
im_write = cv2.imread('datasets/ic15/ic15_test_images' + im_w_name)[:, :, ::-1]
TypeError: 'NoneType' object is not subscriptable
what can i do for this mistake: File "ContourNet/maskrcnn_benchmark/data/datasets/evaluation/word/word_eval.py", line 470, in prepare_for_boundary_segmentation im_write = cv2.imread('datasets/ic15/ic15_test_images' + im_w_name)[:, :, ::-1] TypeError: 'NoneType' object is not subscriptable