Traceback (most recent call last):
  File "electrum\gui\qt\send_tab.py", line 573, in do_pay_or_get_invoice
  File "electrum\gui\qt\send_tab.py", line 585, in do_pay_invoice
  File "electrum\gui\qt\send_tab.py", line 241, in pay_onchain_dialog
  File "electrum\gui\qt\confirm_tx_dialog.py", line 121, in have_enough_funds_assuming_zero_fees
  File "electrum\gui\qt\send_tab.py", line 227, in <lambda>
  File "electrum\wallet.py", line 1670, in make_unsigned_transaction
  File "electrum\wallet.py", line 218, in get_locktime_for_new_transaction
  File "electrum\blockchain.py", line 486, in is_tip_stale
  File "electrum\blockchain.py", line 482, in header_at_tip
  File "electrum\util.py", line 1268, in func_wrapper
  File "electrum\blockchain.py", line 469, in read_header
  File "electrum\blockchain.py", line 431, in assert_headers_file_available
FileNotFoundError: Electrum headers_dir does not exist. Was it deleted while running?