Fatal Error when trying to change the theme

I’m currently using Kopy WP and have loved it.

However, I need a little more from my site now and have started to look at other themes. The issue I have is if I change my thing I see this error on the site:

Fatal error: Call to undefined function vc_map_get_attributes() in /home/racingca/public_html/wp-content/plugins/ishyoboy-kopy-assets/ishyoboy-shortcodes/ishyoboy-shortcodes.php on line 193

Any help will be really appreciated.

Thanks!