Occurs NameError when running demo

[TymonXie]

Occurs NameError when i run the demo:
"""
Traceback (most recent call last):
File "demo.py", line 129, in
demo(opt)
File "demo.py", line 84, in demo
ret = detector.run(img)
File "/root/TraDeS/src/lib/detector.py", line 164, in run
self.show_results(self.debugger, image, results)
File "/root/TraDeS/src/lib/detector.py", line 492, in show_results
if pred_mask in item:
NameError: name 'pred_mask' is not defined
"""