Fatal error: Uncaught Error: Class 'Symfony\Polyfill\Php80\PhpToken' not found in /opt/lampp/htdocs/io.core.websocket/vendor/symfony/polyfill-php80/Resources/stubs/PhpToken.php:13 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/io.core.websocket/vendor/symfony/polyfill-php80/Resources/stubs/PhpToken.php on line 13