Fatal error: Uncaught Error: Call to undefined function add_filter() in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\會員外掛\user-registration-advanced-fields\includes\functions-uraf-core.php:111 Stack trace: #0 {main} thrown in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\會員外掛\user-registration-advanced-fields\includes\functions-uraf-core.php on line 111