Delete the line
/home/barbar84/www/wp-admin
File: tools.php

Dòng [47/98]:
'content' => '<p>' . __( 'Categories have hierarchy, meaning that you can nest sub-categories. Tags do not have hierarchy and cannot be nested. Sometimes people start out using one on their posts, then later realize that the other would work better for their content.' ) . '</p>' .
Fix

Ấn tiếp tục để Delete và ở lại trang, ấn Delete để Delete và quay về List dòng
Function