Traceback (most recent call last):
  File "electrum\gui\qt\network_dialog.py", line 404, in set_server
  File "electrum\network.py", line 393, in run_from_another_thread
  File "concurrent\futures\_base.py", line 446, in result
  File "concurrent\futures\_base.py", line 391, in __get_result
  File "electrum\util.py", line 1211, in wrapper
  File "electrum\network.py", line 640, in set_parameters
  File "electrum\network.py", line 660, in switch_lagging_interface
  File "electrum\blockchain.py", line 482, in header_at_tip
  File "electrum\util.py", line 1240, 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?