Php Laravel事件错误，函数的参数太少

我试图广播一个没有成功的事件。我找不到问题所在，我也没有主意。我得到的错误是

"Too few arguments to function App\Events\ConversationUpdate::__construct(),
1 passed in /app/Events/ConversationUpdate.php on line 36 and exactly 2 expected"

我试图做的是在创建消息时，向聊天室广播一个事件，并用新消息实时更新聊天室

这是我的密码：

控制器：

public function newConversationMessage(Thread $conversation, Request $request)
    {
        $user = Auth::user();
        $message = Message::create([
            'thread_id' => $conversation->id,
            'user_id' => $user->id,
            'body' => $request->body,
        ]);
        $message->user; 
        broadcast(new ConversationUpdate($conversation->id, $message));    
        return $message;
    }

活动：

namespace App\Events;

use Illuminate\Broadcasting\Channel;
use Illuminate\Queue\SerializesModels;
use Illuminate\Broadcasting\PrivateChannel;
use Illuminate\Broadcasting\PresenceChannel;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;

class ConversationUpdate implements ShouldBroadcast
{
    use Dispatchable, InteractsWithSockets, SerializesModels;

    public $conversationId;


    public $message;


    /**
     * Create a new event instance.
     *
     * @return void
     */
    public function __construct($conversationId, $message)
    {
        $this->conversationId = $conversationId;
        $this->message = $message;
    }

    public function broadcastOn()
    {
        return new ConversationUpdate('conversation-'.$this->conversationId.'-updated');
    }
}

---

在函数

broadcastOn（）

中，您应该返回如下内容

return new PrivateChannel('conversation-'.$this->conversationId.'-updated');

并且不是您所在的同一类的另一个实例（错误取决于您在构造函数中传递的单个参数的影响）