Fatal error: Uncaught Error: Interface 'Composer\Plugin\PluginInterface' not found in /var/www/courses.riftvalley.net/wordpress/wp-content/plugins/depicter/vendor/composer/installers/src/Composer/Installers/Plugin.php:9 Stack trace: #0 {main} thrown in /var/www/courses.riftvalley.net/wordpress/wp-content/plugins/depicter/vendor/composer/installers/src/Composer/Installers/Plugin.php on line 9