code: def onError(self, event):
      raise NotImplementedError()
  
imports: import json
  from six.moves.urllib.parse import urlencode
  import pyalgotrade
  from pyalgotrade.websocket import client
  import pyalgotrade.logger
label_desc: Use image node_id 9 for calling the WebSocketClient obj's underlying member method code with example usage: obj.onError(event) without return types