unicode error on backup

[Konfekt]

Using the latest release, ./apk_mass_install -b gives the error message

Traceback (most recent call last):
  File "apk_mass_install.py", line 454, in <module>
  File "apk_mass_install.py", line 343, in main
  File "apk_mass_install.py", line 101, in pull_apk
  File "subprocess.py", line 805, in getstatusoutput
  File "subprocess.py", line 626, in check_output
  File "subprocess.py", line 695, in run
  File "subprocess.py", line 1059, in communicate
  File "/usr/lib/python3.5/codecs.py", line 321, in decode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf1 in position 14: invalid continuation byte
[21836] Failed to execute script apk_mass_install