File "electrum/gui/qt/__init__.py", line 221, in start_new_window
  File "electrum/gui/qt/installwizard.py", line 311, in run_and_get_wallet
  File "electrum/base_wizard.py", line 79, in run
  File "electrum/base_wizard.py", line 122, in upgrade_storage
  File "electrum/gui/qt/installwizard.py", line 486, in waiting_dialog
  File "electrum/base_wizard.py", line 115, in on_finished
  File "electrum/base_wizard.py", line 119, in do_upgrade
  File "electrum/util.py", line 336, in <lambda>
  File "electrum/util.py", line 332, in do_profile
  File "electrum/storage.py", line 362, in upgrade
  File "electrum/util.py", line 336, in <lambda>
  File "electrum/util.py", line 332, in do_profile
  File "electrum/storage.py", line 107, in write
  File "electrum/storage.py", line 119, in _write