Sidebar broken

Hi, I followed the instructions on the installation guide for this plugin and my sidebar broke. I’ve returned the code to it’s previous state and it still will not appear. This is the code: <?php if ( is_active_sidebar( ‘right-widget’ ) ) : ?> <aside class=”aside” role=”complementary”> <?php dynamic_sidebar( ‘right-widget’ ); ?> </aside><!– .aside –> <?php endif; ?> What should I change to make the plugin work? Thank you https://wordpress.org/plugins/multiple-sidebars/