Fatal error:  Uncaught Error: Class "phpbb\filesystem\filesystem" not found in /apache$root/htdocs/vamp/includes/functions.php:3314
Stack trace:
#0 /apache$root/htdocs/vamp/includes/functions.php(3073): phpbb_filter_root_path('/apache$root/ht...')
#1 /apache$root/htdocs/vamp/vendor/composer/ClassLoader.php(576): msg_handler(2, 'include(/apache...', '/apache$root/ht...', 576)
#2 /apache$root/htdocs/vamp/vendor/composer/ClassLoader.php(576): include('/apache$root/ht...')
#3 /apache$root/htdocs/vamp/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/apache$root/ht...')
#4 /apache$root/htdocs/vamp/vendor/symfony/config/ResourceCheckerConfigCache.php(24): Composer\Autoload\ClassLoader->loadClass('Symfony\\Compone...')
#5 /apache$root/htdocs/vamp/vendor/composer/ClassLoader.php(576): include('/apache$root/ht...')
#6 /apache$root/htdocs/vamp/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/apache$root/ht...')
#7 /apache$root/htdocs/vamp/vendor/symfony/config/ConfigCache.php(26): Composer\Autoload\ClassLoader->loadClass('Symfony\\Compone...')
#8 /apache$root/htdocs/vamp/vendor/composer/ClassLoader.php(576): include('/apache$root/ht...')
#9 /apache$root/htdocs/vamp/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/apache$root/ht...')
#10 /apache$root/htdocs/vamp/phpbb/di/container_builder.php(157): Composer\Autoload\ClassLoader->loadClass('Symfony\\Compone...')
#11 /apache$root/htdocs/vamp/common.php(115): phpbb\di\container_builder->get_container()
#12 /apache$root/htdocs/vamp/posting.php(20): include('/apache$root/ht...')
#13 {main}
  thrown in /apache$root/htdocs/vamp/includes/functions.php on line 3314