File "electrum\util.py", line 853, in run_with_except_hook
  File "threading.py", line 864, in run
  File "electrum\gui\qt\main_window.py", line 2594, in privkeys_thread
  File "electrum\wallet.py", line 351, in export_private_key
  File "electrum\keystore.py", line 192, in get_private_key