Fatal error: Uncaught Error: Cannot instantiate abstract class Bitrix\Main\Application in /home/bitrix/www/bitrix/modules/main/lib/application.php:99
Stack trace:
#0 /home/bitrix/www/bitrix/modules/main/lib/modulemanager.php(14): Bitrix\Main\Application::getInstance()
#1 /home/bitrix/www/bitrix/modules/main/lib/loader.php(100): Bitrix\Main\ModuleManager::getInstalledModules()
#2 /home/bitrix/www/404.php(5): Bitrix\Main\Loader::includeModule()
#3 /home/bitrix/www/bitrix/urlrewrite.php(4): include_once('...')
#4 {main}
thrown in /home/bitrix/www/bitrix/modules/main/lib/application.php on line 99