[phpBB Debug] PHP Warning: in file [ROOT]/vendor/composer/ClassLoader.php on line 571: include(): Failed opening '[ROOT]/vendor/composer/../symfony/yaml/Yaml.php' for inclusion (include_path='.:/opt/alt/php82/usr/share/pear:/opt/alt/php82/usr/share/php:/usr/share/pear:/usr/share/php')

Fatal error: Uncaught Error: Class "Symfony\Component\Yaml\Yaml" not found in /home/G/geobergenno/subdomener/forum/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php:661 Stack trace: #0 /home/G/geobergenno/subdomener/forum/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php(117): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->loadFile() #1 /home/G/geobergenno/subdomener/forum/phpbb/di/container_builder.php(217): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->load() #2 /home/G/geobergenno/subdomener/forum/phpbb/di/container_builder.php(444): phpbb\di\container_builder->get_container() #3 /home/G/geobergenno/subdomener/forum/phpbb/di/container_builder.php(162): phpbb\di\container_builder->load_extensions() #4 /home/G/geobergenno/subdomener/forum/common.php(127): phpbb\di\container_builder->get_container() #5 /home/G/geobergenno/subdomener/forum/viewtopic.php(20): include('/home/G/geoberg...') #6 {main} thrown in /home/G/geobergenno/subdomener/forum/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php on line 661