Class "Google\Cloud\AIPlatform\V1\GenerateContentConfig" not found

Gemini API
, ,
1

Trying to use PHP SDK to read a sound file from GCS and then process it using Gemini Pro 2.5. SDK loaded and working. Keep getting an error: Class “Google\Cloud\AIPlatform\V1\GenerateContentConfig” not found

require '../vendor/autoload.php';

use Google\Cloud\AIPlatform\V1\Client\PredictionServiceClient;
use Google\Cloud\AIPlatform\V1\GenerateContentConfig;
use Google\Cloud\AIPlatform\V1\GenerateContentRequest;
use Google\Cloud\AIPlatform\V1\Content;
use Google\Cloud\AIPlatform\V1\Part;
use Google\Cloud\AIPlatform\V1\FileData;
// use Google\Cloud\AIPlatform\V1\GenerationConfig;
use Google\Cloud\AIPlatform\V1\SafetySetting;
use Google\Cloud\AIPlatform\V1\SafetySetting\HarmCategory;
use Google\Cloud\AIPlatform\V1\SafetySetting\HarmBlockThreshold;
use Google\Cloud\AIPlatform\V1\Tool;
use Google\Cloud\AIPlatform\V1\Type\HarmCategory as HarmCategoryAlias;

...

      // 4. Prepare the Request
      // $formattedResourceName = $predictionServiceClient->modelServicePath($projectId, $location, $modelName);
      $formattedResourceName = "projects/{$projectId}/locations/{$location}/publishers/google/models/{$modelName}";

      // Optional: Set generation configuration (e.g., temperature)
      $config = new GenerateContentConfig([
        'temperature' => 0.2,
        'max_output_tokens' => 1048,
      ]);

      $request = new GenerateContentRequest([
        'model' => $formattedResourceName,
        'contents' => [$content],
        'config' => $config,
      ]);

      // 5. Execute the Prediction Call
      echo "Sending request to Gemini 2.5 Pro...\n";

      try {
        $response = $predictionServiceClient->generateContent($request);

etc

The error occurs on the line $config = new GenerateContentConfig([

I’ve deleted all the files, reinstalled the SDK’s etc. Gemini AI help is also unable to assist.