WP Smart Editor need at least PHP 5.3 version, please update php before installing the plugin.

'; } } //Add actions add_action( 'admin_init', 'wpse_disable_plugin' ); add_action( 'admin_notices', 'wpse_show_error' ); //Do not load anything more return; } if (!defined('WPSE_PLUGIN_FILE')) { define('WPSE_PLUGIN_FILE', __FILE__); } if (!defined('WPSE_LANG_DIR')) { define('WPSE_LANG_DIR', plugin_dir_path(__FILE__).'languages/'); } require_once (plugin_dir_path(__FILE__).'install.php'); require_once (plugin_dir_path(__FILE__).'inc/wpse-main.php'); $wpse_main = new wpse_main(); // Load jutranslation helper include_once('jutranslation' . DIRECTORY_SEPARATOR . 'jutranslation.php'); call_user_func( '\Joomunited\WPSE\Jutranslation\Jutranslation::init' , __FILE__, 'wp-smart-editor', 'WP Smart Editor', 'wp-smart-editor', 'languages' . DIRECTORY_SEPARATOR . 'wp-smart-editor-en_US.mo');