Ошибка библиотеки Google Drive flysystem-google-drive в Laravel

Я захостил свой тестовый проект Laravel на Heroku, но, поскольку он не поддерживает загрузку файлов, мне пришлось использовать Google Drive. Для этого я установил этот пакет (flysystem-google-drive) и сделал все, что было рекомендовано в этом руководстве. Но даже при установке пакета flysystem, composer выдал либо предупреждение, либо ошибку, код которой я привел ниже. Что это и как исправить есть идеи?

UPD. Пробовал делать как рекомендуют здесь (добавив classmap в composer.json autoload), но безрезультатно. После этого вылазит новая ошибка:

[RuntimeException] Could not scan for classes inside “vendor/google/apiclient/src/Google” which does not appear to be a file nor a folder

Class Google_Service_Adsense_AdClientAdCode located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\AdClientAdCode.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_AdUnitAdCode located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\AdUnitAdCode.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_Cell located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\Cell.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ContentAdsSettings located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ContentAdsSettings.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_Date located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\Date.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_Header located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\Header.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_HttpBody located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\HttpBody.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListAccountsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListAccountsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListAdClientsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListAdClientsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListAdUnitsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListAdUnitsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListAlertsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListAlertsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListChildAccountsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListChildAccountsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListCustomChannelsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListCustomChannelsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListLinkedAdUnitsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListLinkedAdUnitsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListLinkedCustomChannelsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListLinkedCustomChannelsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListPaymentsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListPaymentsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListSavedReportsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListSavedReportsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListSitesResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListSitesResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ListUrlChannelsResponse located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ListUrlChannelsResponse.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_ReportResult located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\ReportResult.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_Resource_AccountsAdclientsAdunits located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\Resource\AccountsAdclientsAdunits.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_Resource_AccountsAdclientsCustomchannels located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\Resource\AccountsAdclientsCustomchannels.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_Resource_AccountsAdclientsUrlchannels located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\Resource\AccountsAdclientsUrlchannels.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_Resource_AccountsSites located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\Resource\AccountsSites.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_Row located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\Row.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_Site located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\Site.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense_TimeZone located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense\TimeZone.php does not comply with psr-0 autoloading standard. Skipping.
Class Google_Service_Adsense located in D:/OpenServer/domains/Laravel_store/vendor/google/apiclient-services/src\Google\Service\AdSense.php does not comply with psr-0 autoloading standard. Skipping.