Traceback (most recent call last):
  File "electrum\gui\qt\main_window.py", line 2480, in closeEvent
  File "electrum\gui\qt\main_window.py", line 2509, in clean_up
  File "electrum\gui\qt\__init__.py", line 427, in close_window
  File "electrum\daemon.py", line 602, in stop_wallet
  File "concurrent\futures\_base.py", line 446, in result
  File "concurrent\futures\_base.py", line 391, in __get_result
  File "electrum\daemon.py", line 611, in _stop_wallet
  File "electrum\wallet.py", line 436, in stop
  File "electrum\wallet.py", line 369, in save_db
  File "electrum\wallet_db.py", line 1497, in write
  File "electrum\util.py", line 445, in <lambda>
  File "electrum\util.py", line 441, in do_profile
  File "electrum\wallet_db.py", line 1507, in _write
  File "electrum\storage.py", line 97, in write
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'e:\\dropbox\\bittech\\electrum_data\\wallets\\default_wallet.tmp.2460' -> 'e:\\dropbox\\bittech\\electrum_data\\wallets\\default_wallet'