Calibre not transferring ebooks to Kobo

Hi,


PC's configuration
Windows 10, 64 bits
Calibre 2.76
+ Extension KoboTouchExtended 2.8.2 dated sept 19, 2016

Devices
Kobo Aura Edition 2, firmware 4.2.8110
Kobo Glo HD, firmware 3.19.5761
The 2 Kobo are detected by Windows 10 and by Calibre.


Problem
The transfer of ebooks to the devices is impossible

calibre, version 2.76.0
ERREUR : Erreur: Erreur pendant la communication avec le dispositif

'bool' object has no attribute '__getitem__'

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 88, in run
File "site-packages\calibre\gui2\device.py", line 587, in _upload_books
File "calibre_plugins.kobotouch_extended.device.driver" , line 335, in upload_books
File "site-packages\calibre\devices\kobo\driver.py", line 1950, in upload_books
File "calibre_plugins.kobotouch_extended.device.driver" , line 259, in _modify_epub
File "ntpath.py", line 288, in expanduser
TypeError: 'bool' object has no attribute '__getitem__'

Even with KoboTouchExtended* desactived, the problem remains.


* Error's message with KobotouchExtended :
calibre, version 2.76.0

ERREUR : Exception non gérée: <b>TypeError</b>:QLineEdit.setText(str): argument 1 has unexpected type 'bool'

calibre 2.76 [64bit] embedded-python: True is64bit: True
Windows-8-6.2.9200 Windows ('64bit', 'WindowsPE')
('Windows', '8', '6.2.9200')
Python 2.7.9
Windows: ('8', '6.2.9200', '', 'Multiprocessor Free')
Successfully initialized third party plugins: KoboTouchExtended (2, 8, 2)
Traceback (most recent call last):
File "site-packages\calibre\gui2\preferences\plugins.py", line 290, in double_clicked
File "site-packages\calibre\gui2\preferences\plugins.py", line 371, in modify_plugin
File "site-packages\calibre\customize\__init__.py", line 155, in do_user_config
File "calibre_plugins.kobotouch_extended.device.driver" , line 139, in config_widget
File "calibre_plugins.kobotouch_extended.device.koboext ended_config", line 42, in __init__
File "calibre_plugins.kobotouch_extended.device.koboext ended_config", line 70, in __init__
File "calibre_plugins.kobotouch_extended.device.koboext ended_config", line 136, in __init__
TypeError: QLineEdit.setText(str): argument 1 has unexpected type 'bool'



Other successful tests
- No transfer problem of the same library with Calibre 2.76, run on another PC with OS Windows 7x64
- No transfer problem of the same library with the portable Calibre 2.76


Thank you for your assistance.

Kind regards