CLI use error:UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 2: invalid start byte

[qym77]

decode time ms: 191.00403785705566
Traceback (most recent call last):
File "/mnt/shared/AI_4/wanghaoyu/invisible-watermark/./invisible-watermark", line 106, in
sys.exit(main())
File "/mnt/shared/AI_4/wanghaoyu/invisible-watermark/./invisible-watermark", line 99, in main
wm = wm.decode('utf-8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 2: invalid start byte
i want to see what can be extract from photo,but do not show anything.