Traceback (most recent call last):
  File "electrum\gui\qt\main_window.py", line 1650, in do_pay
  File "electrum\gui\qt\main_window.py", line 1664, in do_pay_invoice
  File "electrum\gui\qt\main_window.py", line 1716, in pay_onchain_dialog
  File "electrum\gui\qt\confirm_tx_dialog.py", line 177, in __init__
  File "electrum\gui\qt\util.py", line 344, in __init__
  File "electrum\gui\qt\confirm_tx_dialog.py", line 86, in update_tx
  File "electrum\gui\qt\main_window.py", line 1705, in <lambda>
  File "electrum\wallet.py", line 1413, in make_unsigned_transaction
  File "electrum\wallet.py", line 216, in get_locktime_for_new_transaction
  File "electrum\blockchain.py", line 484, in is_tip_stale
  File "electrum\blockchain.py", line 480, in header_at_tip
  File "electrum\util.py", line 1150, in func_wrapper
  File "electrum\blockchain.py", line 467, in read_header
  File "electrum\blockchain.py", line 429, in assert_headers_file_available
FileNotFoundError: Electrum headers_dir does not exist. Was it deleted while running?