error in auxiliary/scanner/http/crawler

[x86 31p <x8631p () gmail com>]

hi list,

i'm getting error in using auxiliary/scanner/http/crawler
 Auxiliary failed: RuntimeError Could not load Anemone/Nokogiri: no
such file to load -- robots
[-] Call stack:
[-]   /opt/metasploit3/msf3/lib/msf/core/auxiliary/crawler.rb:55:in `setup'
[*] Auxiliary module execution completed


then i'm found this issue
http://www.metasploit.com/redmine/issues/3288 and install "gem install
nokogiri", yes in backtrack first i have to install some lib also

$ sudo apt-get install libxml2 libxml2-dev libxslt-dev
$ gem install nokogiri

then i close the msfconsole and run that again but no luck. got the same error

what i'm missing ??
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