Laravel custom validation returning method doesnot exist

I am trying to create my own custom laravel custom validation rule using the service provider way.

I came up with the following which is stored inside app/Services/CustomValidator.php

   <?php 

namespace App\Services;

class CustomValidator extends \Illuminate\Validation\Validator {

    public function __construct($translator, $data, $rules, $messages = array(), $customAttributes = array())
    {
        parent::__construct($translator, $data, $rules, $messages, $customAttributes);
        $this->setCustomMessages([
            'not_empty_string'=> 'The field must not be empty'
        ]);
    }

  public function validateNotEmptyString($attribute, $value, $parameters)
  {   
      return (bool) preg_match( '/""/', $value );
  }
}

?>

and my provider stored inside the providers folder

<?php

namespace App\Providers;

use Validator;
use Illuminate\Support\ServiceProvider;
use App\Services\CustomValidator;

class CustomValidationServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
        Validator::resolver(function($translator, $data, $rules, $messages)
        {
            return new CustomValidator($translator, $data, $rules, $messages);
        });
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }
}

and I have added the provider to my config/app.php

'providers' => [

    /*
     * Laravel Framework Service Providers...
     */
    Illuminate\Auth\AuthServiceProvider::class,
    Illuminate\Broadcasting\BroadcastServiceProvider::class,
    Illuminate\Bus\BusServiceProvider::class,
    Illuminate\Cache\CacheServiceProvider::class,
    Illuminate\Foundation\Providers\ConsoleSupportServiceProvider::class,
    Illuminate\Cookie\CookieServiceProvider::class,
    Illuminate\Database\DatabaseServiceProvider::class,
    Illuminate\Encryption\EncryptionServiceProvider::class,
    Illuminate\Filesystem\FilesystemServiceProvider::class,
    Illuminate\Foundation\Providers\FoundationServiceProvider::class,
    Illuminate\Hashing\HashServiceProvider::class,
    Illuminate\Mail\MailServiceProvider::class,
    Illuminate\Pagination\PaginationServiceProvider::class,
    Illuminate\Pipeline\PipelineServiceProvider::class,
    Illuminate\Queue\QueueServiceProvider::class,
    Illuminate\Redis\RedisServiceProvider::class,
    Illuminate\Auth\Passwords\PasswordResetServiceProvider::class,
    Illuminate\Session\SessionServiceProvider::class,
    Illuminate\Translation\TranslationServiceProvider::class,
    Illuminate\Validation\ValidationServiceProvider::class,
    Illuminate\View\ViewServiceProvider::class,

    /*
     * Application Service Providers...
     */
    App\Providers\AppServiceProvider::class,
    App\Providers\AuthServiceProvider::class,
    App\Providers\EventServiceProvider::class,
    App\Providers\RouteServiceProvider::class,
    Laravel\Spark\Providers\SparkServiceProvider::class,
    App\Providers\SparkServiceProvider::class,
    Laravel\Cashier\CashierServiceProvider::class,

    //custom classes

    Felixkiss\UniqueWithValidator\UniqueWithValidatorServiceProvider::class,
    App\Providers\CustomValidationServiceProvider::class
],

The Provider i added seems to conflict with the Felixkiss Provider as whenever I try to validate a rule like

private $rules = [
                'name' => 'required|unique_with:tests,suite_id',
                'description' => 'not_empty_string|required',
                'expected_result' => 'not_empty_string|required',
                'suite_id' => 'required',
                 'project_id' => 'required',
            ];

I come up with the following error which actually is a method on the other provider. I am not sure what is the problem here as I seem to have done everything by the book.

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