calibre, version 0.8.62 ERROR: Unhandled exception: <b>TypeError</b>:'ConfigWidget' object is not callable Traceback (most recent call last): File "calibre_plugins.reading_list.action", line 732, in show_configuration File "calibre_plugins.reading_list.__init__", line 48, in do_user_config File "site-packages\calibre\customize\__init__.py", line 150, in do_user_config TypeError: 'ConfigWidget' object is not callable