TypeError: 'NoneType' object is not callable

[jovian-2wang]

Traceback (most recent call last): File "C:/Users/DELL/Desktop/Super-Resolution-Images-master/main.py", line 41, in for p in path(): TypeError: 'NoneType' object is not callable。In the main.py I cannot to solve, Can you tell me how to settle it, thank so so much！