Trait method __sleep has not been applied, because there are collisions

I am trying to trigger an event whenever an user is created but but this error pops up.

<?php

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;

class NewUser
{
  use Dispatchable, InteractsWithSockets, SerializesModels;

    /**
     * Create a new event instance.
     *
     * @return void
     */

    use SerializesModels;

    public $user;

    public function __construct(App\User $user)
    {
        //
        $this->user = $user;

    }


}

I have tried searching for this __sleep function but I can't find it, and I've also tired various things with using use App\User int the top vs in the function parameter itself.

What is the issue?

via Chebli Mohamed