Methods with the same name as their class will not be constructors in a future version of PHP

Hi,

When i upload and activate motorcars theme to my Wordpress i get the following error:

"Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; SMTheme has a deprecated constructor in /home/user/domains/domain.com/public_html/wp-content/themes/motorcars/inc/library.php on line 2

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; AdminPage has a deprecated constructor in /home/user/domains/domain.com/public_html/wp-content/themes/motorcars/inc/administrator.php on line 6

Fatal error: Cannot redeclare removeslashes() (previously declared in /home/user/domains/domain.com/public_html/wp-content/plugins/wp-polls/wp-polls.php:1781) in /home/user/domains/domain.com/public_html/wp-content/themes/motorcars/inc/administrator.php on line 821

There has been a critical error on your website. Please check your site admin email inbox for instructions."


PHPversion: 7.4
Wordpress: 5.5.1

How can i fix this?