Admin area widget management | WordPress.org

When I open the widget manager I get this error

aided for /web/htdocs/www.mysite.com/home/wp-content/plugins/eventprime-event-calendar-management/includes/core/admin/blocks/index.js in /web/htdocs/www.spaziosocial. com/home/wp-content/plugins/eventprime-event-calendar-management/includes/core/admin/blocks/class-ep-magic-blocks.php on line 128

I would like to point out that my PHP platform is V.8.2