I updated Magento to the latest version via Magento connect , it was success but after the update I get blank screen for admin and frontend.
When I put
if (isset($_SERVER['MAGE_IS_DEVELOPER_MODE']) || true) {
Mage::setIsDeveloperMode(true);
}
at my index.php
I get below error:
Fatal error: Class 'Mage' not found in how can i solve it please help i want urgent fix .