Traceback (most recent call last):
  File "electrum\gui\qt\main_window.py", line 3216, in closeEvent
  File "electrum\gui\qt\main_window.py", line 3227, in clean_up
  File "electrum\simple_config.py", line 170, in set_key
  File "electrum\simple_config.py", line 179, in _set_key_in_user_config
  File "electrum\simple_config.py", line 271, in save_user_config
OSError: [Errno 22] Invalid argument: 'E:\\electrum_data\\config'