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I had the same error, reproduced below, when trying to update the plugin with a connected device. After disconnecting, install functioned normally.
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
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