FIRST off thanks for the great input ZEROF AND going out of his way to chat to the armitage devs
**NOTE guys I live in root and Ive notice I keep forgetting about the user that does'nt use root and I leave out sudo commands here and there so anything I write use a root terminal use su to get a root terminal
ok looking at your paste you have two versions installed
with some gems this can cause a conflict i.e warvox there is some gems that you need to install the earlier version then update
or it will not run ... this is an example of using the running different versions of gems
lets make sure you are running ruby 1.9.3
su
rvm list | if grep -e "1.9.3" > /dev/null ; then echo "We are in buisness";else echo "Opps we are running some old ass ruby";fi
if the output is "We are in buisness" then you are running ruby 1.9.3

if the output is "Opps we are running some old ass ruby" then you are running 1.9.2 and advise to upgrade as 1.9.3 loads the metasploit modules faster
but you can do that later lets continue !!!!
remove nokogiri and install the latest
gem uninstall nokogiri ## answer yes to remove both versions
gem cleanup all
gem install nokogiri --version=1.5.5
if you still have issues please post and the community will get to the bottom of his
r083rt