I am having problem in generating the application. Can anyone help.

I had purchased a theme from themeforest. There was also an application in it. I have the source code of which. I have installed the theme. But there is a problem in generating the application. Documentation is also given to generate the application. But some error is coming. Which I am giving below in the screenshot.

Theme Link:- https://themeforest.net/item/wilcity-directory-listing-wordpress-theme/22066447
Documentation Link:- https://documentation.wilcity.com/