Fatal error: Uncaught Error: Call to undefined function __() in /opt/app-root/src/wp-content/plugins/simple-page-sidebars/admin/views/meta-box-sidebar-pages.php:4 Stack trace: #0 {main} thrown in /opt/app-root/src/wp-content/plugins/simple-page-sidebars/admin/views/meta-box-sidebar-pages.php on line 4