Why does importing utils/util.py result in an error?

[ziFan99]

Traceback (most recent call last):
File "main.py", line 73, in
main()
File "main.py", line 24, in main
from Deblurring.src.trainer import Trainer
File "/root/autodl-tmp/NAF-DPM-main/Deblurring/src/trainer.py", line 10, in
import utils.util as util
ModuleNotFoundError: No module named 'utils.util'