OSError: [Errno 28] No space left on device

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "app/electrum/gui/qml/qefx.py", line 95, in rateSource
  File "app/electrum/exchange_rate.py", line 745, in set_exchange
  File "app/electrum/simple_config.py", line 111, in _set_config_value
  File "app/electrum/simple_config.py", line 304, in set_key
  File "app/electrum/simple_config.py", line 314, in _set_key_in_user_config
  File "app/electrum/simple_config.py", line 426, in save_user_config
OSError: [Errno 28] No space left on device