For me, there was this error:
calibre, version 0.9.9
Code:
BŁĄD: Nieznany wyjątek: <b>IndexError</b>:list index out of range
Traceback (most recent call last):
File "calibre_plugins.epubmerge.dialogs", line 82, in do_loop
File "calibre_plugins.epubmerge.dialogs", line 91, in do_when_finished
File "calibre_plugins.epubmerge.epubmerge_plugin", line 385, in _start_merge
File "calibre_plugins.epubmerge.epubmerge", line 254, in doMerge
IndexError: list index out of range
Plugin version 1.24