docs: private boolean isError(Object result) {
  		if(result != null){
  			if(result instanceof BaseResult){
  				BaseResult baseResult = (BaseResult)result;
  				return !baseResult.isSuccess();
  			}else if(result instanceof MchBase){
  				MchBase mchBase = (MchBase)result;
  				if("FAIL".equalsIgnoreCase(mchBase.getReturn_code())||
  				   "FAIL".equalsIgnoreCase(mchBase.getResult_code())){
  					return true;
  				}
  			}
  		}
  		return false;
  	}