Traceback (most recent call last):
  File "electrum\gui\qt\send_tab.py", line 578, in do_pay_or_get_invoice
  File "electrum\gui\qt\send_tab.py", line 601, in do_pay_invoice
  File "electrum\gui\qt\send_tab.py", line 275, in pay_onchain_dialog
  File "electrum\gui\qt\send_tab.py", line 531, in save_pending_invoice
  File "electrum\wallet.py", line 1102, in save_invoice
  File "electrum\wallet.py", line 395, in save_db
  File "electrum\wallet_db.py", line 1567, in write
  File "electrum\util.py", line 470, in <lambda>
  File "electrum\util.py", line 465, in do_profile
  File "electrum\wallet_db.py", line 1577, in _write
  File "electrum\storage.py", line 98, in write
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'd:\\dropbox\\wallet_backup_2\\default_wallet.backup.tmp.13168' -> 'd:\\dropbox\\wallet_backup_2\\default_wallet.backup'