public function err($message, $code = -1, $level = 'info')
    {
        return $this->ret->err($message, $code, $level);
    }
public function err($message, $code = -1, $level = 'info')
    {
        return $this->ret->err($message, $code, $level);
    }
public function err ( $ message , $ code = - 1 , $ level = 'info' ) { return $ this -> ret -> err ( $ message , $ code , $ level ) ; }
Return operation failed result, and logs with an info level

@param string|array $message
@param int $code
@param string $level
@return array
Return operation failed result and logs with an info level