这个错误是什么原因啊？

[HLKunn]

CK+:
2021-12-06 08:03:03.795587: I tensorflow/stream_executor/platform/default/dso_loader.cc:48] Successfully opened dynamic library cudart64_101.dll
100%|██████████| 8/8 [00:00<00:00, 534.32it/s]
0%| | 0/981 [00:00<?, ?it/s]
Traceback (most recent call last):
File "E:/人工智能应用技术/大作业/FacialExpressionRecognition/src/LBP.py", line 200, in
evaluate_lbp(1, 3, 3)
File "E:/人工智能应用技术/大作业/FacialExpressionRecognition/src/LBP.py", line 126, in evaluate_lbp
res = LBP().get_lbp(x[i])
File "E:/人工智能应用技术/大作业/FacialExpressionRecognition/src/LBP.py", line 56, in get_lbp
mat = image[i * widx: (i + 1) * widx, j * widy: (j + 1) * widy]
TypeError: 'NoneType' object is not subscriptable

Process finished with exit code 1