Laravel seeder : Call to undefined method Illuminate\Notifications\Notification::getConnectionName()

I have a many to many relationship between two models:

User

namespace App\Models;


class User extends Model
{
    use HasApiTokens, Notifiable,hasFactory;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    ];

}

Notification

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
 
class Notification extends Model
{
    /**
     * @var array
     */
    protected $guarded = ['id'];
    use HasFactory;
    /**
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function user()
    {
        return $this->belongsTo(User::class);
    }

 
}

I created a factory for each model and a Seeder which calls the two factories in order to create users and attach notifications to each one of them.

NotificationUserSeeder:

<?php

namespace Database\Seeders;

use App\Models\Notification;
use App\Models\User;
use Illuminate\Database\Seeder;

class MockNotificationUser extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */


    }
}

I am getting this error when running db:seed:

Call to undefined method Illuminate\Notifications\Notification::getConnectionName()