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/phpbb/class_loader.php(160): msg_handler(2, 'require(/apache...', '/apache$root/ht...', 160)
#2 /apache$root/htdocs/vamp/phpbb/class_loader.php(160): require('/apache$root/ht...')
#3 [internal function]: phpbb\class_loader->load_class('\\phpbb\\db\\drive...')
#4 /apache$root/htdocs/vamp/phpbb/config_php_file.php(137): class_exists('phpbb\\db\\driver...')
#5 /apache$root/htdocs/vamp/phpbb/di/container_builder.php(570): phpbb\config_php_file->convert_30_dbms_to_31('phpbb\\db\\driver...')
#6 /apache$root/htdocs/vamp/phpbb/di/container_builder.php(237): phpbb\di\container_builder->inject_dbal_driver()
#7 /apache$root/htdocs/vamp/common.php(115): phpbb\di\container_builder->get_container()
#8 /apache$root/htdocs/vamp/viewtopic.php(20): include('/apache$root/ht...')
#9 {main}
  thrown in /apache$root/htdocs/vamp/includes/functions.php on line 3314