InvalidArgumentException Unknown format "Str" on [Larvel 9.35.1] [php 8.0.9] – Laravel

I have create a category Table i want to feed some fake date using Faker and Factory after doingusing php artisan db:seed i get error of InvalidArgumentException Unknown format "Str"
i have try each format as per itellisense suggest as well as syntax as per Laravel – 9 in both case i get same error i have try each things but i didn’t get any satisfactory resolution if any can help please let me know here is my and code CategoryFactory.php and DatabaseSeeder.php and below this error which i got.

*This is my CategoryFactory code

<?php

namespace DatabaseFactories;

use IlluminateDatabaseEloquentFactoriesFactory;
use IlluminateSupportStr;

/**
 * @extends IlluminateDatabaseEloquentFactoriesFactory<AppModelsodel:Categories>
 */
class CategoriesFactory extends Factory
{
    /**
     * Define the model's default state.
     *
     * @return array<string, mixed>
     */
    public function definition()
    {
        $cname = $this->faker->unique()->words($nb = 2, $asText = true);
        // $cslug = Str::slug($cname, $separator = '-', $language = 'en' );
        $cslug = Str::slug($cname, '-');
        return [
            'category_name' => $cname,
            'category_slug' => $cslug

        ];
    }
}

DatabaseSeeder.php code

<?php

namespace DatabaseSeeders;

// use IlluminateDatabaseConsoleSeedsWithoutModelEvents;

use AppModelsCategories;
use AppModelsProducts;
use IlluminateDatabaseSeeder;

class DatabaseSeeder extends Seeder
{
    /**
     * Seed the application's database.
     *
     * @return void
     */
    public function run()
    {
        Categories::factory()
                    ->count(6)
                    ->create();
        
        Products::factory()
                    ->count(16)
                    ->create();
    }
}

**

i get error of this

**

 InvalidArgumentException 
PS C:xampphtdocseclobber> php artisan db:seed

   INFO  Seeding database.  


   InvalidArgumentException 

  ***Unknown format "Str"***

  at C:xampphtdocseclobbervendorfakerphpfakersrcFakerGenerator.php:731
    727▕                 return $this->formatters[$format];
    728▕             }
    729▕         }
    730▕
  ➜ 731▕         throw new InvalidArgumentException(sprintf('Unknown format "%s"', $format));
    732▕     }
    733▕
    734▕     /**
    735▕      * Replaces tokens ('{{ tokenName }}') with the result from the token method call

  1   C:xampphtdocseclobbervendorfakerphpfakersrcFakerGenerator.php:696
      FakerGenerator::getFormatter("Str")

  2   C:xampphtdocseclobbervendorfakerphpfakersrcFakerGenerator.php:961
      FakerGenerator::format("Str", [])