File "electrum\gui\qt\network_dialog.py", line 62, in on_update
  File "electrum\gui\qt\network_dialog.py", line 376, in update
  File "electrum\gui\qt\network_dialog.py", line 109, in update
  File "electrum\blockchain.py", line 206, in get_name
  File "electrum\blockchain.py", line 444, in get_hash
  File "electrum\blockchain.py", line 182, in func_wrapper
  File "electrum\blockchain.py", line 424, in read_header