Traceback (most recent call last):
  File "mainwindow.pyc", line 215, in callback_enumerate
  File "C:\Program Files (x86)\Tinkerforge\Brickv\plugin_system\plugin_manager.py", line 56, in get_plugin_from_name
    return plugin(ipcon, uid)
  File "C:\Program Files (x86)\Tinkerforge\Brickv\plugin_system\plugins\io4\io4.py", line 61, in __init__
    value = self.io.get_value()
  File "bindings\ip_connection.pyc", line 76, in func
  File "bindings\bricklet_io4.pyc", line 72, in get_value
  File "bindings\ip_connection.pyc", line 346, in send_request
  File "bindings\ip_connection.pyc", line 271, in data_to_return
TypeError: 'NoneType' object is unsubscriptable
Traceback (most recent call last):
  File "mainwindow.pyc", line 148, in tab_changed
  File "C:\Program Files (x86)\Tinkerforge\Brickv\plugin_system\plugins\ambient_light\ambient_light.py", line 93, in start
    self.cb_illuminance(self.al.get_illuminance())
  File "bindings\ip_connection.pyc", line 76, in func
  File "bindings\bricklet_ambient_light.pyc", line 68, in get_illuminance
  File "bindings\ip_connection.pyc", line 346, in send_request
  File "bindings\ip_connection.pyc", line 271, in data_to_return
TypeError: 'NoneType' object is unsubscriptable