Preview Error on Theamforest

Hi, I am interested in buying this template for a client but it is giving a database error: https://preview.themeforest.net/item/sayidan-university-alumni-wp-theme/full_screen_preview/17495779?_ga=2.173628192.225394198.1698699391-1437917825.1697135980When I go to live Preview. I get an error.