Traceback (most recent call last):
  File "app/electrum/bitcoin.py", line 591, in base_decode
KeyError: 47

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "app/electrum/gui/qml/qewallet.py", line 811, in signMessage
  File "app/electrum/wallet.py", line 2959, in sign_message
  File "app/electrum/keystore.py", line 224, in sign_message
  File "app/electrum/keystore.py", line 699, in get_private_key
  File "app/electrum/bip32.py", line 136, in from_xkey
  File "app/electrum/bitcoin.py", line 608, in DecodeBase58Check
  File "app/electrum/bitcoin.py", line 593, in base_decode
electrum.bitcoin.BaseDecodeError: Forbidden character 47 for base 58