Error from PHP when running Google Cloud Platform AI request - PredictRequest

I have the following controller in Laravel 11 and i'm testing a PredictRequest() using the Google Cloud Ai Platform (Vertex AI).

I was encoding the image as base_64 and sending it, but was getting the error:

Invalid instances: string_value:
​

I have now changed the value to text ('test) but it's still giving the same error.

<?php

namespace App\Http\Controllers;

use Google\Cloud\AIPlatform\V1\Client\PredictionServiceClient;
use Google\Cloud\AIPlatform\V1\PredictRequest;
use Google\Protobuf\Value;

class GoogleCloudAIController extends Controller {
protected $projectId;
protected $location;
protected $endpointId;
protected $client;
protected $credentials;

public function __construct()
{
// Define your Google Cloud project information
$this->projectId = env('GOOGLE_CLOUD_PROJECT_ID');
$this->location = env('GOOGLE_LOCATION');
$this->endpointId = env('GOOGLE_CLOUD_AI_ENDPOINT_ID');
$this->credentials = env('GOOGLE_APPLICATION_CREDENTIALS');

// Initialize Google Cloud PredictionServiceClient with credentials
$this->client = new PredictionServiceClient(
[
'credentials' => json_decode(file_get_contents($this->credentials), true),
'apiEndpoint' => $this->location . '-aiplatform.googleapis.com',
]
);
}

// Test
public function index() {
return response()->json($this->predictImage('https://roofguard-photos.s3.eu-west-2.amazonaws.com/52U81-V4C0Z-RH0FO/2024/November/07/202411070535.jpg'));
}

/**
* Send an image to Google Cloud AI Platform for prediction.
*
* @param string $imagePath Local path to the image file
* @return \Illuminate\Http\JsonResponse The prediction response from Google Cloud
*/
public function predictImage(string $imagePath)
{
// Read and encode the image in Base64
$imageData = file_get_contents($imagePath);
$encodedImage = base64_encode($imageData);

// Wrap the encoded image content in a Google\Protobuf\Value
$instance = new Value();
$instance->setStringValue('test');

// Prepare the request
$request = new PredictRequest();
$formattedName = $this->client->endpointName($this->projectId, $this->location, $this->endpointId);
$request->setEndpoint($formattedName);
$request->setInstances(['contents' => $instance]);

// Call the Prediction API
try {
$response = $this->client->predict($request);
} catch (\Exception $e) {
return response()->json($e->getMessage());
}
/*
// Parse and return the response
$predictions = [];
foreach ($response->getPredictions() as $prediction) {
$predictions[] = $prediction->getStructValue()->getFields();
}

return $predictions;
*/
}
}


Any ideas what could be wrong?

Thanks.

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