[BeeTee-Ess]

I have attempted to install v1.3.6 of this plugin several times, and it tells me there is a problem. Here is the error report:

calibre, version 1.30.0
ERROR: Install Plugin Failed: A problem occurred while installing this plugin. This plugin will now be uninstalled. Please post the error message in details below into the forum thread for this plugin and restart Calibre.

Traceback (most recent call last):
File "site-packages\calibre\gui2\dialogs\plugin_updater.py", line 711, in _install_clicked
File "site-packages\calibre\customize\ui.py", line 379, in add_plugin
File "site-packages\calibre\customize\ui.py", line 539, in initialize_plugin
InvalidPlugin: Initialization of plugin Traceback (most recent call last):
File "site-packages\calibre\customize\ui.py", line 533, in initialize_plugin
File "calibre_plugins.ios_reader_apps.__init__", line 883, in initialize
File "calibre_plugins.ios_reader_apps.__init__", line 1169, in _get_connected_device_info
InitialConnectionError: Unable to connect to iDevice
failed with traceback:
Traceback (most recent call last):
File "site-packages\calibre\customize\ui.py", line 533, in initialize_plugin
File "calibre_plugins.ios_reader_apps.__init__", line 883, in initialize
File "calibre_plugins.ios_reader_apps.__init__", line 1169, in _get_connected_device_info
InitialConnectionError: Unable to connect to iDevice

Any ideas? Thanks.