OSError: [Errno 28] No space left on device

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "electrum\gui\qt\main_window.py", line 2615, in do_toggle
  File "electrum\plugin.py", line 152, in toggle
  File "electrum\plugin.py", line 135, in enable
  File "electrum\simple_config.py", line 171, in set_key
  File "electrum\simple_config.py", line 180, in _set_key_in_user_config
  File "electrum\simple_config.py", line 273, in save_user_config
OSError: [Errno 28] No space left on device