Fatal error: Uncaught Error: Undefined constant Config::GOOGLE_ADS_ENABLED in /var/www/otouczelnie/test/application/custom_classes/AdSense.php:10 Stack trace: #0 /var/www/otouczelnie/test/application/core/MY_SmartyController.php(183): AdSense::getAd() #1 /var/www/otouczelnie/test/application/modules/uczelnia_dzial/controllers/uczelnia_dzial.php(617): MY_SmartyController->getGoogleAd() #2 /var/www/otouczelnie/test/system/core/CodeIgniter.php(359): uczelnia_dzial->main() #3 /var/www/otouczelnie/test/index.php(238): require_once('...') #4 {main} thrown in /var/www/otouczelnie/test/application/custom_classes/AdSense.php on line 10