Fatal error** : Can't use function return value in write context helpers-shortcode.php

I just bought the theme flatsome 3.8.1 and once installed, when I go to activate the theme there is following error:

Fatal error : Can’t use function return value in write context in /home4/username/public_html/wp-content/themes/flatsome/inc/helpers/helpers-shortcode.php on line 444

How can I solve that?
thanks for everything

Hi

I think this error is for php version. Are your web server using php 7 or greater?
The best way to get the support is Contact your purchased theme Author and let them know. Theme Author @UX-themes will help you about this error fixing.

Thanks