I installed Calibre 5.23.0 with FanFicFare 4.4.0.
I tried the instructions from
https://github.com/JimmXinu/FanFicFa...erCacheFeature.
I updated the cache path for Firefox with my path.
C:\Users\user\AppData\Local\Mozilla\Firefox\Profil es\xvgdeguf.default-1563538979722\cache2
The old error message is gone.
I now get the error message
Directory does not contain a known browser cache type: 'C:\Program Files\Calibre2',
but I cannot locate the error.