You are not authorised to view this resource, you need to login, seeing this statement does not necessarily mean there is a problem with your site. If your site has content that requires you to login to view the content or article it would be normal to see this message. Most Joomla users realize that they will see this message if they are trying to access registered content items.

However there may come a time when you are logged in or you are the administrator and you get the 'authorised to view' message.