WARNING(2): "Use of undefined constant SESSION_CHECK_SSL_SESSION_ID - assumed 'SESSION_CHECK_SSL_SESSION_ID' (this will throw an Error in a future version of PHP)"

FATAL ERROR(1): "Uncaught Error: Class 'LanguageCode' not found in /mnt/web402/a3/15/59350215/htdocs/shop-oekologisches-bauen/GXMainComponents/Shared/LanguageProvider.inc.php:366
Stack trace:
#0 /mnt/web402/a3/15/59350215/htdocs/shop-oekologisches-bauen/includes/application_top.php(525): LanguageProvider->getActiveCodes()
#1 /mnt/web402/a3/15/59350215/htdocs/shop-oekologisches-bauen/product_info.php(28): require_once('/mnt/web402/a3/...')
#2 {main}
  thrown"