我发现以下错误Fatal error: Call to a member function get_page_permastruct() /link-template.php on line 276 当我调用类内构造函数时wp_insert_post($new_post);.

add_action( \'plugins_loaded\', array ( \'test\', \'init\' ) );
class test{

    public static function init()
    {
        new self;
    }

    //the consructor for parser admin
    function __construct(){

        global $wpdb;
        $this->db = $wpdb;      

        if ($_POST[\'action\'] == \'add-page\'){
            add_action( \'plugins_loaded\', array ( $this, \'add_newpage\' ) );
            $this->add_newpage();
        }
    public function add_newpage(){
        $new_post = array(
                \'post_title\' => $_POST[\'page-name\'],
                \'post_content\' => \'\',
                \'post_status\' => \'publish\',
                \'post_type\' => \'page\'
        );

        $post_id = wp_insert_post($new_post);   
        $newtarget = $this->db->insert( 
                    \'wp_test_table\', 
                    array( 
                        \'post_id\' => $post_id, 
                        \'slug\' => \'test\'
                    ), 
                    array( 
                        \'%d\', 
                        \'%s\' 
                        ) 
                    );

    }

}