Drupal Commerce 2.0 shopping functionality not working

Hello Folks,

I installed a third party theme to make an ecommerce website which is as follows.


Unfortunately, its shopping cart feature is not working. I can not add any thing to the shopping car. Could anyone please let me know what might be missing? Unfortunately, the developer is not responsive at all.

Thanks and regards

Drupal version: 

Source: https://www.drupal.org/taxonomy/term/22/feed