При добавлении статьи выдает ошибку: Notice: Undefined index: tag in /home/x/xxx/xxxx/public_html/admin/model/blog/article.php on line 16Warning: Cannot modify header information - headers already sent by (output started at /home/x/xxx/xxxx/public_html/admin/controller/startup/error.php:34) in /home/x/xxx/xxxx/public_html/system/library/response.php on line 36