File "electrum/gui/qt/__init__.py", line 213, in wrapper
  File "electrum/gui/qt/__init__.py", line 239, in start_new_window
  File "electrum/gui/qt/installwizard.py", line 315, in run_and_get_wallet
  File "electrum/base_wizard.py", line 89, in run
  File "electrum/base_wizard.py", line 132, in upgrade_storage
  File "electrum/gui/qt/installwizard.py", line 490, in waiting_dialog
  File "electrum/base_wizard.py", line 125, in on_finished
  File "electrum/base_wizard.py", line 129, in do_upgrade
  File "electrum/util.py", line 367, in <lambda>
  File "electrum/util.py", line 363, in do_profile
  File "electrum/storage.py", line 359, in upgrade
  File "electrum/util.py", line 367, in <lambda>
  File "electrum/util.py", line 363, in do_profile
  File "electrum/storage.py", line 107, in write
  File "electrum/storage.py", line 119, in _write