code: def handleErrorEvents(self, msg):
          
          # https://www.interactivebrokers.com/en/software/api/apiguide/tables/api_message_codes.htm
          if msg.errorCode is not None and msg.errorCode != -1 and \
                  msg.errorCode not in dataTypes["BENIGN_ERROR_CODES"]:
  
              log = True
  
              # log disconnect errors only once
              if msg.errorCode in dataTypes["DISCONNECT_ERROR_CODES"]:
                  log = False
                  if msg.errorCode not in self.connection_tracking["errors"]:
                      self.connection_tracking["errors"].append(msg.errorCode)
                      log = True
  
              if log:
                  self.log.error("[#%s] %s" % (msg.errorCode, msg.errorMsg))
                  self.ibCallback(caller="handleError", msg=msg)
docs: logs error messages