Fatal error: Uncaught Error: Call to undefined function trigger_deprecation() in /opt/lampp/htdocs/io.core.websocket/vendor/symfony/http-foundation/Session/Attribute/NamespacedAttributeBag.php:14 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/io.core.websocket/vendor/symfony/http-foundation/Session/Attribute/NamespacedAttributeBag.php on line 14