problem in the code

[siwarbouziri]

hello Sir,
when I execute the "acdc_data_preparation.py" script I get errors
"Traceback (most recent call last):
File "acdc_data_preparation.py", line 593, in
group_patient_cases(complete_data_path, dest_path)
File "acdc_data_preparation.py", line 229, in group_patient_cases
cases = sorted(next(os.walk(src_path))[1])
StopIteration"

please could you tell me why and how to fix it?