I’m trying this plugin and I’ve installed it on a new installation of WordPress (version 5.1.1 and PHP version 5.4.45) and Woocoomerce plugin (version 3.6.0), but when I activate this plugin Food Online for Woocommerce (version 2.3.8), my site doesnt work anymore, showing HTTP error 500. When I deactivate this plugin, all works well again. What could being hapening?