Fatal error: Uncaught Error: Interface "OAuth2\ClientAssertionType\ClientAssertionTypeInterface" not found in /usr/local/www/openid/src/OAuth2/ClientAssertionType/HttpBasic.php:15 Stack trace: #0 {main} thrown in /usr/local/www/openid/src/OAuth2/ClientAssertionType/HttpBasic.php on line 15