File "electrum\gui\qt\main_window.py", line 1632, in do_pay
  File "electrum\gui\qt\main_window.py", line 1646, in do_pay_invoice
  File "electrum\gui\qt\main_window.py", line 1696, in pay_onchain_dialog
  File "electrum\gui\qt\confirm_tx_dialog.py", line 118, in have_enough_funds_assuming_zero_fees
  File "electrum\gui\qt\main_window.py", line 1681, in <lambda>
  File "electrum\wallet.py", line 1378, in make_unsigned_transaction
  File "electrum\coinchooser.py", line 331, in make_tx
  File "electrum\coinchooser.py", line 427, in choose_buckets
  File "electrum\coinchooser.py", line 427, in <listcomp>
  File "electrum\coinchooser.py", line 456, in penalty
  File "electrum\coinchooser.py", line 316, in tx_from_buckets
  File "electrum\coinchooser.py", line 235, in _construct_tx_from_selected_buckets