File "electrum\gui\qt\confirm_tx_dialog.py", line 66, in timer_actions
  File "electrum\gui\qt\confirm_tx_dialog.py", line 84, in update_tx
  File "electrum\gui\qt\transaction_dialog.py", line 786, in get_fee_estimator
  File "electrum\gui\qt\amountedit.py", line 128, in get_amount
  File "electrum\util.py", line 686, in quantize_feerate