data loader error

[orydatadudes]

when run test.sh i get he following error
File "/home/projects/ADGAN/test.py", line 44, in
print(len(dataset))
File "/homeprojects/ADGAN/data/custom_dataset_data_loader.py", line 40, in len
return min(len(self.dataset), self.opt.max_dataset_size)
TypeError: 'NoneType' object cannot be interpreted as an integer
what i am doing wrong