Warning: require(/var/www/html/wp-includes/html-api/class-wp-html-doctype-info.php): Failed to open stream: No such file or directory in /var/www/html/wp-settings.php on line 257

Fatal error: Uncaught Error: Failed opening required '/var/www/html/wp-includes/html-api/class-wp-html-doctype-info.php' (include_path='.:/usr/local/lib/php') in /var/www/html/wp-settings.php:257
Stack trace:
#0 /var/www/html/wp-config.php(165): require_once()
#1 /var/www/html/wp-load.php(50): require_once('/var/www/html/w...')
#2 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...')
#3 /var/www/html/index.php(19): require('/var/www/html/w...')
#4 {main}
  thrown in /var/www/html/wp-settings.php on line 257

Fatal error: Uncaught Error: Call to a member function set() on null in /var/www/html/wp-includes/l10n.php:856
Stack trace:
#0 /var/www/html/wp-includes/l10n.php(959): load_textdomain('default', '/var/www/html/w...', 'de_DE')
#1 /var/www/html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler->handle()
#3 {main}
  thrown in /var/www/html/wp-includes/l10n.php on line 856