[Leonatus]

Here we are:

Microsoft Windows [Version 10.0.17763.437]
(c) 2018 Microsoft Corporation. Alle Rechte vorbehalten.

C:\Users\Jürgen>calibre-debug -g
Python function terminated unexpectedly
  'utf8' codec can't decode byte 0xfc in position 13: invalid start byte (Error Code: 1)
Traceback (most recent call last):
  File "site.py", line 101, in main
  File "site.py", line 77, in run_entry_point
  File "site-packages\calibre\__init__.py", line 30, in <module>
  File "site-packages\calibre\startup.py", line 121, in <module>
  File "site-packages\calibre\utils\localization.py", line 203, in set_translators
  File "site-packages\calibre\utils\localization.py", line 88, in get_lang
  File "site-packages\calibre\utils\config_base.py", line 525, in <module>
  File "site-packages\calibre\utils\config_base.py", line 429, in __getitem__
  File "site-packages\calibre\utils\config_base.py", line 439, in get
  File "site-packages\calibre\utils\config_base.py", line 423, in refresh
  File "site-packages\calibre\utils\config_base.py", line 361, in parse
  File "site-packages\calibre\utils\config_base.py", line 300, in serialize
  File "site-packages\calibre\utils\config_base.py", line 64, in json_dumps
  File "json\__init__.py", line 251, in dumps
  File "json\encoder.py", line 210, in encode
UnicodeDecodeError: 'utf8' codec can't decode byte 0xfc in position 13: invalid start byte

C:\Users\Jürgen>