Laravel Jobs Serialization of ‘Closure’ is not allowed - development

Laravel Jobs Serialization of ‘Closure’ is not allowed

I would like to send Data to a NewsletterStore Job. But it’s failing with the following error. Any suggestions?

I also tried to remove the SerializesModels Models trait. Without any success.

Error

Exception
Serialization of 'Closure' is not allowed

Controller

 public function store(StoreNewsletterRequest $request)
    {
        StoreNewsletterJob::dispatch($request);

        return view('backend.dashboard.index');
    }

Job

protected $request;

    public function __construct($request)
    {
        $this->request = $request;
    }

    /**
     * Execute the job.
     *
     * @return void
     */

    public function handle()
    {
        if(!Newsletter::isSubscribed($this->request->email))
        {

            Newsletter::subscribe($this->request->email, [

                config('newsletter.list_fields.firstname') => $this->request->firstname,
                config('newsletter.list_fields.lastname') => $this->request->lastname

            ]);
        }
    }

from Laravel Questions and Answers https://laravelquestions.com/php/laravel-jobs-serialization-of-closure-is-not-allowed/
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