Unknown error: Fancy not working

Hello, 

I setup Fancy as toturial on youtube shows and i get error:

Deprecated: The behavior of unparenthesized expressions containing both '.' and '+'/'-' will change in PHP 8: '+'/'-' will take a higher precedence in /home/naredico/public_html/wp-content/plugins/fancy-product-designer/admin/vendors/libs/less/Less.php on line 5364

What to do?

Greetings, Žan