Traceback (most recent call last):
  File "electrum\gui\qt\network_dialog.py", line 411, in set_server
  File "electrum\network.py", line 387, in run_from_another_thread
  File "concurrent\futures\_base.py", line 439, in result
  File "concurrent\futures\_base.py", line 388, in __get_result
  File "electrum\util.py", line 1118, in wrapper
  File "electrum\network.py", line 634, in set_parameters
  File "electrum\network.py", line 654, in switch_lagging_interface
  File "electrum\blockchain.py", line 480, in header_at_tip
  File "electrum\util.py", line 1150, in func_wrapper
  File "electrum\blockchain.py", line 472, in read_header
Exception: Expected to read a full header. This was only 0 bytes