protected static function newFactory()
{
     return BannerFactory::new();
}

protected static function newFactory()
    {
     return new BannerFactory();
    }

Undefined property: Database\Factories\BannerFactory::$create

<?php

namespace Database\Factories;

use App\Modules\Banner\Models\Banner;
use Illuminate\Database\Eloquent\Factories\Factory;

class BannerFactory extends Factory
{
    /**
    * @var string
    */
    protected $model = Banner::class;

    protected const IMAGES = [
        'assets/images/banner1.png',
        'assets/images/banner2.png'
    ];

    /**
    * @return array
    */
    public function definition()
    {
        return [
           'title' => $this->faker->sentence(),
           'description_title' => $this->faker->sentence,
           'short_description' => $this->faker->paragraph(2),
           'full_description' => $this->faker->paragraph(6),
           'image' => array_rand(self::IMAGES),
           'url' => $this->faker->url(),
          'started_at' => $this->faker->date()
         ];
     }
}