Fatal error: Uncaught Error: Class 'WP_Importer' not found in /var/www/html/wp-content/plugins/one-click-demo-import/vendor/awesomemotive/wp-content-importer-v2/src/WXRImporter.php:7 Stack trace: #0 {main} thrown in /var/www/html/wp-content/plugins/one-click-demo-import/vendor/awesomemotive/wp-content-importer-v2/src/WXRImporter.php on line 7