Laravel notification Broadcasting 500 internal server error occurs - php

Question

I am trying to broadcast a notification in laravel 5.3 when i write
public function via($notifiable)
{
return ['broadcast','database'];
}
error occurs in console 500 internal server error and when i remove broadcast error removes please help here is my notification code
<?php
namespace App\Notifications;
use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Notification;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
use Illuminate\Notifications\Messages\BroadcastMessage;
class userLiked extends Notification implements ShouldBroadcast, ShouldQueue
{
use Queueable;
/**
* Create a new notification instance.
*
* #return void
*/
public function __construct()
{
//
}
/**
* Get the notification's delivery channels.
*
* #param mixed $notifiable
* #return array
*/
public function via($notifiable)
{
return ['broadcast','database'];
}
/**
* Get the array representation of the notification.
*
* #param mixed $notifiable
* #return array
*/
public function toDatabase($notifiable)
{
return [
'status'=>'liked',
'user'=>auth()->user(),
];
}
/**
* Get the array representation of the notification.
*
* #param mixed $notifiable
* #return array|BroadcastMessage
*/
public function toBroadcast($notifiable)
{
return new BroadcastMessage(array(
'status'=>'liked',
'user'=>auth()->user(),
));
}
/**
* Get the array representation of the notification.
*
* #param mixed $notifiable
* #return array
*/
public function toArray($notifiable)
{
return [
//
];
}
}
Here is my cotroller code where i am calling notification
$like = new like();
$like->userId = $request['userId'];
$like->crushId = $request['crushId'];
$like->liked = true;
$like->save();
User::find($like->crushId)->notify(new userLiked());
And here is my user model
<?php
namespace App;
use Illuminate\Support\Facades\Auth;
use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;
class User extends Authenticatable
{
use Notifiable;
public function likes(){
$this->hasMany('App\like');
}
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = [
'username', 'email', 'password',
];
/**
* The attributes that should be hidden for arrays.
*
* #var array
*/
protected $hidden = [
'password', 'remember_token',
];
/**
* #return string
*/
public function receivesBroadcastNotificationsOn()
{
return 'user.'.$this->id;
}
}
Please help i am sick of it