Fatal error: Class 'Bitrix\Main\Context' not found in F:\Xampp\htdocs\bitrix\modules\main\lib\httpcontext.php on line 10

Fatal error: Class 'Bitrix\Main\Diag\ExceptionHandlerLog' not found in F:\Xampp\htdocs\bitrix\modules\main\lib\diag\exceptionhandler.php on line 214