File "electrum\gui\qt\main_window.py", line 93, in onPress
  File "electrum\gui\qt\main_window.py", line 2052, in <lambda>
  File "electrum\gui\qt\__init__.py", line 196, in show_network_dialog
  File "electrum\gui\qt\network_dialog.py", line 49, in __init__
  File "electrum\gui\qt\network_dialog.py", line 325, in __init__
  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 449, in get_hash
  File "electrum\blockchain.py", line 182, in func_wrapper
  File "electrum\blockchain.py", line 424, in read_header