File "electrum/gui/qt/main_window.py", line 1438, in spend_max
  File "electrum/gui/qt/main_window.py", line 1434, in <lambda>
  File "/Volumes/Electrum/Electrum.app/Contents/MacOS/electrum/plugins/trustedcoin/trustedcoin.py", line 328, in make_unsigned_transaction
    tx = mk_tx(outputs + [fee_output])
  File "/Volumes/Electrum/Electrum.app/Contents/MacOS/electrum/plugins/trustedcoin/trustedcoin.py", line 322, in <lambda>
    self, coins=coins, outputs=o, fee=fee, change_addr=change_addr)
  File "electrum/wallet.py", line 1273, in make_unsigned_transaction
  File "electrum/wallet.py", line 209, in get_locktime_for_new_transaction
  File "electrum/blockchain.py", line 490, in is_tip_stale
  File "electrum/blockchain.py", line 486, in header_at_tip
  File "electrum/blockchain.py", line 201, in func_wrapper
  File "electrum/blockchain.py", line 478, in read_header