Fatal error: Uncaught Error: Call to undefined function plugin_dir_path() in /opt/app-root/src/wp-content/plugins/simple-page-sidebars/simple-page-sidebars.php:25 Stack trace: #0 {main} thrown in /opt/app-root/src/wp-content/plugins/simple-page-sidebars/simple-page-sidebars.php on line 25