问php-上传视频提示Class 'Guzzle\Service\Client' not found？

$result = VodApi::upload(
    ['videoPath' => $filePath],
    [
        'videoName' => $key,
        'storageRegion' => 'test-1257832799'
    ]
);

secretId和secretKey已经成功载入，再调用上传方法进行视频上传，报错Class 'Guzzle\Service\Client' not found，但是Guzzle应该已经被遗弃了，难道还要用吗？