Fatal error: Uncaught Error: Interface "IWPML_Upgrade_Command" not found in /home/oxygenco/prod/wordpress/wp-content/plugins/sitepress-multilingual-cms/classes/upgrade/class-wpml-upgrade-localizations-files.php:6 Stack trace: #0 {main} thrown in /home/oxygenco/prod/wordpress/wp-content/plugins/sitepress-multilingual-cms/classes/upgrade/class-wpml-upgrade-localizations-files.php on line 6