使用队列处理微信消息返回报错 “Serialization of 'Closure' is not allowed”

laravel 5.5
php 7.1
报错信息

0: Serialization of 'Closure' is not allowed {"code":0,"message":"Serialization of 'Closure' is not allowed","file":"/Users/renkun/SourceTree/blog/vendor/laravel/framework/src/Illuminate/Queue/Queue.php","line":128}

队列调用

    case 'text': 
                SendCustomerMessage::dispatch($this->app, $message)
                ->onConnection('database');
                return '正在?数据...';
                break;

队列处理方法

    /**
     * Create a new job instance.
     *
     * @return void
     */
    public function __construct($app, $message)
    {
        //
        $this->client = new GuzzleClient();
        $this->app =  $app;
        $this->message = $message;
    }
    public function handle()
    {
        //根据输入，返回消息数组
        $results = $this->handleMessage($this->message['Content']);
        $count = count($results);
        for ($i=0; $i < $count; $i++) { 
            $text = new Text($results[$i]);
            $this->app->customer_service
                ->message($text)
                ->to($this->message['FromUserName'])
                ->send();
        }
    }