No query results for model INSIDE JOB

Hi, i want make a simple task for queue laravel. I have this error in "failed_jobs" Illuminate\Database\Eloquent\ModelNotFoundException: No query results for model....... What did i do wrong?

//controller
    public function addUser(Request $req)
    {
        $user = new User;
        $user->name = $req->name;
        $user->username = $req->username;
        $user->email = $req->email;
        $user->password = bcrypt($req->password);
        dispatch(new adduser($user));
        // adduser::dispatch();
        return 'added';
    }
//Job
class adduser implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
    public $user;
    public function __construct($user)
    {
        $this->user = new User;
        $this->user = $user;
    }
    public function handle()
    {
        $this->user->save();
    }
}