Calibre 2.66 and 2.68 ebook viewer error

Hello calibre 2.66 and 2.68 using ebook_viewer.exe (windows 10) gauge gives me the following error, someone has the solution? .

Thanks

calibre 2.68 embedded-python: True is64bit: False
Windows-8-6.2.9200 Windows ('32bit', 'WindowsPE')
('Windows', '8', '6.2.9200')
Python 2.7.9
Windows: ('8', '6.2.9200', '', 'Multiprocessor Free')
Traceback (most recent call last):
File "site-packages\calibre\gui2\viewer\main.py", line 936, in load_ebook
File "site-packages\calibre\ebooks\oeb\iterator\book.py", line 97, in __init__
File "site-packages\calibre\utils\config.py", line 203, in __init__
File "site-packages\calibre\utils\config.py", line 213, in refresh
File "site-packages\calibre\utils\lock.py", line 76, in read
error: (23, 'ReadFile', 'Error de datos (comprobaci\xf3n de redundancia c\xedclica).')