Fatal error: Uncaught DomainException: Could not load the default credentials. Browse to https://developers.google.com/accounts/docs/application-default-credentials for more information in /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/auth/src/ApplicationDefaultCredentials.php:168 Stack trace: #0 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/gax/src/CredentialsWrapper.php(194): Google\Auth\ApplicationDefaultCredentials::getCredentials(Array, Object(Google\Auth\HttpHandler\Guzzle6HttpHandler), NULL, NULL) #1 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/gax/src/CredentialsWrapper.php(113): Google\ApiCore\CredentialsWrapper::buildApplicationDefaultCredentials(Array, Object(Google\Auth\HttpHandler\Guzzle6HttpHandler)) #2 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/gax/src/GapicClientTrait.php(326): Google\ApiCore\CredentialsWrapper::build(Array) #3 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/gax/src/GapicClientTrait.php(308): Google\Cloud\Kms\V1\Gapic\KeyManagementServiceGapicClient->createCredentialsWrapper(NULL, Array) #4 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/cloud-kms/src/V1/Gapic/KeyManagementServiceGapicClient.php(447): Google\Cloud\Kms\V1\Gapic\KeyManagementServiceGapicClient->setClientOptions(Array) #5 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/quickstart.php(32): Google\Cloud\Kms\V1\Gapic\KeyManagementServiceGapicClient->__construct() #6 {main} Next Google\ApiCore\ValidationException: Could not construct ApplicationDefaultCredentials in /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/gax/src/CredentialsWrapper.php:200 Stack trace: #0 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/gax/src/CredentialsWrapper.php(113): Google\ApiCore\CredentialsWrapper::buildApplicationDefaultCredentials(Array, Object(Google\Auth\HttpHandler\Guzzle6HttpHandler)) #1 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/gax/src/GapicClientTrait.php(326): Google\ApiCore\CredentialsWrapper::build(Array) #2 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/gax/src/GapicClientTrait.php(308): Google\Cloud\Kms\V1\Gapic\KeyManagementServiceGapicClient->createCredentialsWrapper(NULL, Array) #3 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/cloud-kms/src/V1/Gapic/KeyManagementServiceGapicClient.php(447): Google\Cloud\Kms\V1\Gapic\KeyManagementServiceGapicClient->setClientOptions(Array) #4 /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/quickstart.php(32): Google\Cloud\Kms\V1\Gapic\KeyManagementServiceGapicClient->__construct() #5 {main} thrown in /home/ondemand/test.ondemandpro.net/php-docs-samples/kms/vendor/google/gax/src/CredentialsWrapper.php on line 200