I got a situation: List index out of range

[ZhechengLiao]

71% (60 of 84) |################# | Elapsed Time: 0:00:44 ETA: 0:00:21Traceback (most recent call last):
File "/Users/liaozhedeng/Desktop/NFT_Turtle/nft.py", line 238, in
main()
File "/Users/liaozhedeng/Desktop/NFT_Turtle/nft.py", line 229, in main
rt = generate_images(edition_name, num_avatars)
File "/Users/liaozhedeng/Desktop/NFT_Turtle/nft.py", line 173, in generate_images
generate_single_image(trait_paths, os.path.join(op_path, image_name))
File "/Users/liaozhedeng/Desktop/NFT_Turtle/nft.py", line 67, in generate_single_image
bg = Image.open(os.path.join('assets', filepaths[0]))
IndexError: list index out of range