File "electrum\gui\qt\main_window.py", line 106, in onPress
  File "electrum\gui\qt\main_window.py", line 2125, in <lambda>
  File "electrum\gui\qt\__init__.py", line 197, in show_network_dialog
  File "electrum\gui\qt\network_dialog.py", line 56, in __init__
  File "electrum\gui\qt\network_dialog.py", line 340, in __init__
  File "electrum\gui\qt\network_dialog.py", line 385, in update
  File "electrum\blockchain.py", line 235, in get_name
  File "electrum\blockchain.py", line 487, in get_hash
  File "electrum\blockchain.py", line 186, in func_wrapper
  File "electrum\blockchain.py", line 462, in read_header