Fatal Error

It seems that after being functional, Glossary now generates a fatal error on our site. Any ideas on how to resolve this (I have replaced our URL by an *)?

Fatal error: Uncaught Error: Class ‘Yoast_I18n_WordPressOrg_v3’ not found in /var/www/*/citeitdev/htdocs/wp-content/plugins/glossary-by-codeat/backend/Notices.php:84 Stack trace: #0 /var/www/*/citeitdev/htdocs/wp-content/plugins/glossary-by-codeat/backend/Notices.php(59): Glossary\Backend\Notices->alerts_by_libraries() #1 /var/www/*/citeitdev/htdocs/wp-includes/class-wp-hook.php(307): Glossary\Backend\Notices->load_notices() #2 /var/www/*/citeitdev/htdocs/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters() #3 /var/www/*/citeitdev/htdocs/wp-includes/plugin.php(474): WP_Hook->do_action() #4 /var/www/*/citeitdev/htdocs/wp-settings.php(587): do_action() #5 /var/www/*/citeitdev/htdocs/wp-config.php(96): require_once(‘/var/www/*….’) #6 /var/www/*/citeitdev/htdocs/wp-load.php(50): require_once(‘/var/www/*….’) #7 /var/www/*/citeitdev/htdocs/wp-admin/admin.php(34): require_once(‘/var/www/*….’) #8 /var/www/* in /var/www/*/citeitdev/htdocs/wp-content/plugins/glossary-by-codeat/backend/Notices.php on line 84
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