Fatal error: Uncaught Error: Call to undefined function SimplePageOrdering\add_action() in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\simple-page-ordering\class-simple-page-ordering.php:49 Stack trace: #0 D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\simple-page-ordering\class-simple-page-ordering.php(32): SimplePageOrdering\Simple_Page_Ordering::add_actions() #1 D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\simple-page-ordering\class-simple-page-ordering.php(898): SimplePageOrdering\Simple_Page_Ordering::get_instance() #2 D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\simple-page-ordering\simple-page-ordering.php(34): require_once('D:\\www\\wordpres...') #3 {main} thrown in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\simple-page-ordering\class-simple-page-ordering.php on line 49