UnicodeDecodeError: 'ascii' codec can't decode byte 0xe9 in position 1: ordinal not in range(128)

[Merlincool]

I am getting this error UnicodeDecodeError: 'ascii' codec can't decode byte 0xe9 in position 1: ordinal not in range(128)

Traceback (most recent call last):
File "/home/$USER/bin/chtor", line 11, in
load_entry_point('pyrocore', 'console_scripts', 'chtor')()
File "/home/$USER/.local/pyroscope/src/pyrocore/scripts/chtor.py", line 311, in run
MetafileChanger().run()
File "/home/$USER/.local/pyroscope/src/pyrocore/scripts/base.py", line 268, in run
self.mainloop()
File "/home/$USER/.local/pyroscope/src/pyrocore/scripts/chtor.py", line 247, in mainloop
metafile.add_fast_resume(metainfo, datadir)
File "/home/$USER/.local/pyroscope/src/pyrocore/util/metafile.py", line 330, in add_fast_resume
filepath = os.path.join(datapath, fmt.to_utf8(filepath.strip(os.sep)))
File "/home/$USER/.local/pyroscope/lib/python2.7/posixpath.py", line 73, in join
path += '/' + b
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe9 in position 1: ordinal not in range(128)

Details of my OS.
Operating System: Debian GNU/Linux 10 (buster)
Kernel: Linux 4.19.0-5-amd64
Architecture: x86-64

Can't find anyway to make it utf-8 decoding.