wp-includes/comment-template.php:26 – Trying to get property of non-object

Per comments, you need to check for have_comments() first, before using any of the comment-template functions such as get_comment_author(), otherwise they try to call methods on a null comment object, producing PHP warnings.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)