[Python] Error UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid...

https://github.com/affinelayer/pix2pix-tensorflow/tree/master/tools

An error occurred when compiling "process.py" on the above site.

python tools/process.py --input_dir data --operation resize --output_dir data2/resize
data/0.jpg -> data2/resize/0.png

Traceback (most recent call last):
File "tools/process.py", line 235, in <module>
main()
File "tools/process.py", line 167, in main
src = load(src_path)
File "tools/process.py", line 113, in load
contents = open(path).read()
File"/home/user/anaconda3/envs/tensorflow_2/lib/python3.5/codecs.py", line 321, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte


What is the cause of the error? Python's version is 3.5.2.

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