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/network_dialog.py", line 404, in set_server
  File "electrum/network.py", line 393, in run_from_another_thread
  File "concurrent/futures/_base.py", line 446, in result
  File "concurrent/futures/_base.py", line 391, in __get_result
  File "electrum/util.py", line 1239, in wrapper
  File "electrum/network.py", line 623, in set_parameters
  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