I tested it on my Windows 10, 64 bit computer, Calibre v. 5.0.1
Errror message is the same as FritzM has reported:
calibre, version 5.0.0
Code:
FEHLER: Unbehandelter Ausnahmefehler: <b>UnicodeDecodeError</b>:'utf-8' codec can't decode byte 0xe4 in position 2643: invalid continuation byte
calibre 5.0 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.19041-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19041')
Python 3.8.5
Windows: ('10', '10.0.19041', 'SP0', 'Multiprocessor Free')
Interface language: de
Successfully initialized third party plugins: Count Pages (1, 10, 0) && Hyphenate This! (0, 1, 0) && KePub Output (3, 2, 15) && Kobo Utilities (2, 11, 5) && KoboTouchExtended (3, 2, 15) && Modify ePub (1, 4, 1) && Resize Cover (1, 1, 0)
Traceback (most recent call last):
File "calibre_plugins.hyphenatethis.hyphenatethisaction", line 120, in hyphenate
File "calibre_plugins.hyphenatethis.hyphenatethisaction", line 94, in _select_books
File "calibre_plugins.hyphenatethis.hyphenator.hyphenator", line 174, in __init__
File "calibre_plugins.hyphenatethis.hyphenator.hyphenator", line 90, in __init__
File "codecs.py", line 322, in decode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe4 in position 2643: invalid continuation byte
@Vroo: In C:\Users\{Username}\AppData\Local\calibre-cache, there is, in my case, no hyphenation directory. Nevertheless, Polishbooks seems to do the job. I cannot really prove it, as I have, in my Kobo reader, activated the automatic Kobo hyphenation, but in Calibre's reader, hyphenation shows.