Fatal error: Uncaught Error: Interface "Bitrix\Calendar\Sync\Vendor\VendorInterface" not found in D:\ktt\ttepla.com\public_html\bitrix\modules\calendar\lib\sync\vendor\vendor.php:8 Stack trace: #0 {main} thrown in D:\ktt\ttepla.com\public_html\bitrix\modules\calendar\lib\sync\vendor\vendor.php on line 8