Fatal error: Uncaught Error: Interface "Google\ApiCore\HeaderCredentialsInterface" not found in /opt/lampp/htdocs/msjwebcp/vendor/google/gax/src/ApiKeyHeaderCredentials.php:39 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/msjwebcp/vendor/google/gax/src/ApiKeyHeaderCredentials.php on line 39