Please help – I got warning on the Home Page, please help to remove it

Hello, I have the following warning on the home Page, could you help me to understand what happened? – (I have the renamed the file that is mention in warning but it doesn’t work):

** Plugin name: Users licenses management Description: Management of clients licenses Author: H Version: 0.1 */ bonjour
Warning: session_start(): Cannot send session cache limiter – headers already sent (output started at /homepages/8/d328438969/htdocs/wp-content/plugins/licence.php:7) in /homepages/8/d328438969/htdocs/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries-old-old.php on line 33