NSE Joomla Brute & Wordpress Brute Not Work

["Mr. Doel" <doel () mc-crew or id>]

Script : http://nmap.org/nsedoc/scripts/http-joomla-brute.html
http://nmap.org/nsedoc/scripts/http-wordpress-brute.html

When I use the script on a website using Wordpress or Joomla  I always get
the message failed like this :

"NSE: Initial check failed. Password field wasn't found"

Whereas the admin pages already available on the URL eg
http://a.com/wp-admin on wordpress site and http://b.com/administrator on
joomla site

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