File "site-packages\electrum-3.1.3-py3.5.egg\electrum\util.py", line 794, in run_with_except_hook
  File "threading.py", line 862, in run
  File "site-packages\electrum-3.1.3-py3.5.egg\electrum_gui\qt\main_window.py", line 2412, in privkeys_thread
  File "site-packages\electrum-3.1.3-py3.5.egg\electrum\wallet.py", line 432, in export_private_key
  File "site-packages\electrum-3.1.3-py3.5.egg\electrum\keystore.py", line 163, in get_private_key