Fatal error: Uncaught Error: Call to undefined function plugin_dir_path() in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\wp-mail-smtp\wp_mail_smtp.php:118 Stack trace: #0 D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\wp-mail-smtp\wp_mail_smtp.php(178): wp_mail_smtp_check_pro_loading_allowed() #1 {main} thrown in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\wp-mail-smtp\wp_mail_smtp.php on line 118