I see, it seems to me that your scriptpath is misconfigured, but it can also be caused by your server's inability to locate smarty include path. In line 326 you should find this:
PHP Code:
require $this->path->getRoot().$templateClass;
You see that the require() statement is dynamically coded, try hard-code the path of smarty class to your class_mysidia.php file and see if this fixes the problem. By 'hard-coding' I mean typing the unique file path in this require statement, something like:
PHP Code:
require "domain.com/scriptpath/inc/smarty/Smarty.Class.php";