Comment 3 for bug 1176622

the error details:

calibre, version 0.9.29
ОШИБКА: Не могу открыть электронную книгу: 'dict' object has no attribute 'lower'

Traceback (most recent call last):
  File "site-packages\calibre\gui2\viewer\main.py", line 40, in run
  File "threading.py", line 504, in run
  File "site-packages\calibre\ebooks\oeb\iterator\book.py", line 99, in __enter__
  File "site-packages\calibre\customize\conversion.py", line 239, in __call__
  File "site-packages\calibre\ebooks\conversion\plugins\txt_input.py", line 94, in convert
AttributeError: 'dict' object has no attribute 'lower'