未从Codeigniter中的数据库接收数据

我尝试通过CodeIgniter向我的客户发送邮件,就像我注册约会时通过在客户表中查找客户电子邮件发送电子邮件一样&其他表格中的其他内容;发送电子邮件进行确认。

这是我的App\u型号。php

  public function send_mail()
     {

       $query=$this->db
       ->select('*, employee.name_emp as emp_name, customer.name as 
        cust_name, servicetype.name_set as s_name, serviceplan.price as 
         p_rice')
       ->from('appointment')

         ->join( 'customer', 'customer.id= appointment.name_app')
         ->join( 'servicetype', 'servicetype.id_set= appointment.sertype')
         ->join( 'employee', 'employee.id_emp= appointment.emp')
       //  ->join('serviceplan', 'serviceplan.price=appointment.price_app')
       ->get();



    return $query->result();
     }

这是我的App\u控制器

       function sendmail($appointment_id){
        $config = Array(
            'protocol' => 'smtp',
            'smtp_host' => 'ssl://smtp.googlemail.com',
            'smtp_port' => 465,
            'smtp_user' => 'xxx',
            'smtp_pass' => 'xxx',
            'mailtype'  => 'html',
            'charset'   => 'iso-8859-1'
        );
        $this->load->library('email', $config);
        $this->email->set_newline("\r\n");

        // Set to, from, message, etc.
        $this->load->model('App_model');
        $appointment=$this->App_model->send_mail($appointment_id);
       // print_r($appointment);
        //exit();

       $message=Array(
           $message=Array(
      'Name'=>$appointment[0]->cust_name,
     'Service Type'=>$appointment[0]->s_name,
    // 'Service Plan'=>$appointment->p_rice,
     'Employee'=>$appointment[0]->emp_name,
      'Date'=>$appointment[0]->date,
     'Time'=>$appointment[0]->time

    );
          $this->email->from('xxx', 'xxx');
               $this->email->to('xxx');

               $this->email->subject('Confirmation of Your Appointment');
               $this->email->message($message);

        $result = $this->email->send();
         }

我查过了 print_r($appoinment) &它显示所有数据,但当我运行整个程序时,它不会显示任何错误&静止邮件不工作

遇到PHP错误 严重性:通知

消息:正在尝试获取非对象的属性

文件名:controllers/App\u controller。php

谢谢你的帮助