Buying Need help installing OpenCart theme

I already installed the theme, however, I'm getting the following error:

Fatal error: Uncaught exception 'Exception' with message 'Error: Could not load model total/sub_total!' in /home/ticket/public_html/valog.com/system/storage/modification/system/engine/loader.php:59 Stack trace: #0 /home/ticket/public_html/valog.com/catalog/controller/common/cart.php(39): Loader->model('total/sub_total') #1 [internal function]: ControllerCommonCart->index(Array) #2 /home/ticket/public_html/valog.com/system/storage/modification/system/engine/action.php(51): call_user_func_array(Array, Array) #3 /home/ticket/public_html/valog.com/system/storage/modification/system/engine/loader.php(24): Action->execute(Object(Registry), Array) #4 /home/ticket/public_html/valog.com/catalog/controller/common/header.php(149): Loader->controller('common/cart') #5 [internal function]: ControllerCommonHeader->index(Array) #6 /home/ticket/public_html/valog.com/system/storage/modification/system/engine/action.php(51): call_user_func_array(Array, Array) #7 /home/ticket/public_html/valog.com/system/storage/modification/system/engine/l in /home/ticket/public_html/valog.com/system/storage/modification/system/engine/loader.php on line 59

Can anyone fix it? how much would you charge? thanks!

 

Sounds like your theme's version isn't compatible with yoru current version of opencart

 

Use latest version of your theme. Because it is backdated version. It is not compatible for your current Open Cart version.