connecting laravel with geminy AI

hello I am trying to connect laravel with geminy , ai . I connected successfuly with google , but . it is returning an error .

this is my class

namespace App\Services;


use Google\Client;
use Google\Service\Aiplatform;
use Google\Service\Aiplatform\GoogleCloudAiplatformV1GenerateContentRequest;
use Google\Service\Aiplatform\GoogleCloudAiplatformV1Part;

use Exception;
use GuzzleHttp\Exception\RequestException;

class googleGeminiService
{
    protected  $client;
    protected $aiplatform;
    protected $project_id;
    protected $region;
    protected $model_name;


    public function __construct()
    {
        // Retrieve configuration from config/services.php
        $this->project_id = config('services.google.project_id');
        $this->region = config('services.google.location', 'us-central1');
        $this->model_name = "gemini-pro";

        // Get the authenticated Google Client
        $this->client = $this->getClient();
        // Create an instance of the Vertex AI service
        $this->aiplatform = new Aiplatform($this->client);
    }

    /**
     * Creates and authenticates a Google Client object
     * @return Client The Google Client instance
     */
    private function getClient(): Client
    {

        $client = new Client();

        // Set Authentication using Service Account
        if (config('services.google.key_file_path')) {
            $client->setAuthConfig(config('services.google.key_file_path'));
        }

        // Set Scopes for Gemini API
        $client->setScopes(['https://www.googleapis.com/auth/cloud-platform']);

        return $client;
    }

    /**
     * Generates content using the Gemini API
     * @param string $prompt The prompt for the model
     * @return mixed The API Response from the Gemini API or throws an exception.
     * @throws Exception
     */

    /**
     * Generates content using the Gemini API
     * @param string $prompt The prompt for the model
     * @return mixed The API Response from the Gemini API or throws an exception.
     * @throws Exception
     */
    public function generateContent(string $prompt)
    {
        try {
            // Create content part with the prompt
            $part = new GoogleCloudAiplatformV1Part();
            $part->setText($prompt);

            // Create the generate content request
            $requestBody = new GoogleCloudAiplatformV1GenerateContentRequest();
            $requestBody->setContents([
                ['parts' => [$part]]
            ]);


            // Construct the full resource name including project, region, and model
            //$resourceName = "projects/{$this->project_id}/locations/{$this->region}/publishers/google/models/{$this->model_name}";
            $resourceName = sprintf('projects/%s/locations/%s/publishers/google/models/%s', $this->project_id, $this->region, $this->model_name);

            // Make API call to generate content
            $response = $this->aiplatform->projects_locations_publishers_models->generateContent(
                $resourceName,
                $requestBody
            );



            // Return the full api response.
            return $response;

        } catch (RequestException $e) {
            // Throw an exception with a helpful message
            throw new Exception("Error generating content: " . $e->getMessage());
        } catch (Exception $e){
            // Throw an exception with a helpful message
            throw new Exception("Unexpected error generating content: " . $e->getMessage());
        }

    }
}

I gave a dd() in

  $this->client = $this->getClient();
        dd($this->client);

and it is printing the connection successfully .

but when comes here -

 $response = $this->aiplatform->projects_locations_publishers_models->generateContent(
                $resourceName,
                $requestBody
            );

it is giving an errror -

The service you requested is not available at this time.<p>Service error -27.  <ins>That’s all we know.