seg_liver_train.py and .mat file format

[dyl0101]

Hello,I want to add edge information in network structure,and I only extracted the boundary image of the liver as the boundary ground-truth of the liver.
But when I trained the liver segmentation network, the following errors occurred:
'ValueError: Unknown mat file type, version 0, 0'
I didn't change the .mat file, just regenerate training_volum_3.txt with a boundary image path.
So I want to ask you how to solve this problem?
Look forward to your reply.
Thanks.