在 App Engine flex 環境中部署 PHP 應用程序時，嘗試創建 Googles 的 TextToSpeechClient 類實例時出現致命服務器錯誤。在本地主機上，它可以正常工作。以下是錯誤信息：“注意：PHP 消息：PHP 致命錯誤：未捕獲錯誤：在 /app/web/get_voices2.php:46 中找不到類 'Google\Cloud\TextToSpeech\V1\TextToSpeechClient'”我的 get_voices2.php<?php// includes the autoloader for libraries installed with composerrequire __DIR__ . '/vendor/autoload.php';require_once('includes/dbPDO.php');// Imports the Cloud Client Libraryuse Google\Cloud\TextToSpeech\V1\AudioConfig;use Google\Cloud\TextToSpeech\V1\AudioEncoding;use Google\Cloud\TextToSpeech\V1\SsmlVoiceGender;use Google\Cloud\TextToSpeech\V1\SynthesisInput;use Google\Cloud\TextToSpeech\V1\TextToSpeechClient;use Google\Cloud\TextToSpeech\V1\VoiceSelectionParams;use Google\Cloud\Storage\StorageClient;if (isset($_POST['language']) && isset($_POST['quality'])) {        $storage = new StorageClient();        $language = $_POST['language'];        $quality = $_POST['quality'];        $dsn = getenv('MYSQL_DSN');        $user = getenv('MYSQL_USER');        $password = getenv('MYSQL_PASSWORD');        $dbh = OpenCon($dsn,$user,$password);    echo getListVoices($language, $quality, $dbh);}function getListVoices($lan, $quality,$conn) {    $optionData = '<option id = "0" disabled>Select voice</option>';    // instantiates a client on line 46    $client = new TextToSpeechClient(['credentials' => json_decode(file_get_contents('cred.json'), true)]);    $response = $client->listVoices();    $voices = $response->getVoices(); } 這是我的 App Engine 文件夾結構。請注意 app.yaml 文件不在 web 目錄中。它與 /various 和 /php-docs-sample PHP 應用程序的 Web 目錄結構位于同一目錄中我的 composer.json 文件：{    "require": {        "google/cloud-speech": "^1.0.1",        "google/gax": "^1.1",         "grpc/grpc": "^1.4",         "google/protobuf": "^v3.3.0",        "google/auth": "^1.8",        "phpseclib/phpseclib": "^2.0"    }}我通過運行以下命令在 App Engine 上部署我的項目：gcloud app deploy -version dev我希望我提供了完整的信息。