Not able to select menu item

I am using watir+ruby for my test application
I have used the following code to select “My services”

But I am not able to select the menu item “My Peergroups”.

I tried “” with the menu item xpath but I am getting the
following error

method_missing': undefined methodset’ for #Watir::Anchor:0x17efc68
(NoMethodError)from C:/Documents and
Settings/nnair/workspace/MDRapp/MDRpg1.rb:12:in `’”