Google AdWords API PHP报告定义服务选择器

ReportDefinitionService的Selector类遇到问题。该类不存在。以下是来自谷歌官方示例的代码：

// Load the service, so that the required classes are available.
$user->LoadService('ReportDefinitionService', 'v201603');
// Optional: Set clientCustomerId to get reports of your child accounts
// $user->SetClientCustomerId('INSERT_CLIENT_CUSTOMER_ID_HERE');
// Create selector.
$selector = new Selector(); //The error happens here. Class 'Selector' isn't found
$selector->fields = array('CampaignId', 'AdGroupId', 'Id', 'Criteria','CriteriaType', 'Impressions', 'Clicks', 'Cost');

文件/vvendor/googleads/googleads-php-lib/src/Google/Api/Ads/AdWords/v201603/ReportDefinitionService.php中没有Selector定义，而此类在许多其他服务中都有定义。

我正试图让它在Laravel 5.1 上工作

如果我将目录vendor/googleads/googleads-php-lib/src/Google/Api/Ads/AdWords/Util/v201603添加到我的classmap:，错误就会消失

"autoload": {
 "classmap": [
  ...
  "vendor/googleads/googleads-php-lib/src/Google/Api/Ads/AdWords/Util/v201603"
 ],
 ...

但我不确定我是否能做到。知道出了什么问题吗？