calibre, version 0.8.20
ERROR: Unhandled exception: <b>TypeError</b>:'NoneType' object is not subscriptable
Traceback (most recent call last):
File "site-packages\calibre\gui2\preferences\plugins.py", line 269, in customize_plugin
File "site-packages\calibre\gui2\preferences\plugins.py", line 344, in modify_plugin
File "site-packages\calibre\customize\__init__.py", line 150, in do_user_config
File "site-packages\calibre\devices\usbms\deviceconfig.py", line 80, in config_widget
File "site-packages\calibre\gui2\device_drivers\configwidget. py", line 77, in __init__
TypeError: 'NoneType' object is not subscriptable
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