I have upgraded Prestashop from 15.6.X.X to 16.X.X.X. After the up-gradation, default-bootstrap is activated as a default theme.
When I try to active my theme, the front end page get blank page.
It showing an error, Fatal error: Uncaught exception 'SmartyException' with message 'Unable to load template file .
How can I activate the old theme in upgraded version? Please advice.
There are often problems with Prestashop upgrades. You need to completely fix all problems before using your template. Try to option file config/defines.inc.php and change the site to dev mode
/* Debug only */
if (!defined('_PS_MODE_DEV_'))
define('_PS_MODE_DEV_', true);
All errors will show on your frontpage, try to fix all those errors and get your website totally works. Normal you will see problems with database, some tables was not successfully added new columns, then try to add those columns manually via your phpmyadmin
Good luck!
