[phpBB Debug] PHP Warning: in file [ROOT]/vendor/composer/ClassLoader.php on line 576: include([ROOT]/vendor/composer/../twig/twig/src/Lexer.php): Failed to open stream: No such file or directory
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/composer/ClassLoader.php on line 576: include(): Failed opening '[ROOT]/vendor/composer/../twig/twig/src/Lexer.php' for inclusion (include_path='.;C:/php/pear')

Fatal error: Uncaught Error: Class "Twig\Lexer" not found in D:\inetpub\webs\retro-computingit\phpBB3\phpbb\template\twig\lexer.php:16 Stack trace: #0 D:\inetpub\webs\retro-computingit\phpBB3\phpbb\class_loader.php(160): require() #1 D:\inetpub\webs\retro-computingit\phpBB3\cache\production\container_4335734bbdd20f586549a504dff5f80c.php(4481): phpbb\class_loader->load_class() #2 D:\inetpub\webs\retro-computingit\phpBB3\phpbb\di\container_builder.php(173): require('...') #3 D:\inetpub\webs\retro-computingit\phpBB3\common.php(115): phpbb\di\container_builder->get_container() #4 D:\inetpub\webs\retro-computingit\phpBB3\viewtopic.php(20): include('...') #5 {main} thrown in D:\inetpub\webs\retro-computingit\phpBB3\phpbb\template\twig\lexer.php on line 16