When I run "rspec" under one of my Ruby on Rails projects, I get the error pasted below. This wasn't originally an issue, perhaps an update caused this, I don't know. What's the best way to resolve? I want to be careful as this is quite a complicated software development environment that took quite a while to put together and I don't want to start breaking things by "trying" stuff. I'm of course using Time Machine but still. Please advise.
MacMini:common dev$ rspec
/usr/local/rvm/gems/ruby-1.9.3-p327/gems/nokogiri-1.6.0/lib/nokogiri.rb:28:in `require': dlopen(/usr/local/rvm/gems/ruby-1.9.3-p327/gems/nokogiri-1.6.0/lib/nokogiri/nokogiri.bundle, 9): Library not loaded: /Users/dev/.bundler/tmp/90095/gems/nokogiri-1.6.0/ports/i686-apple-darwin11/libxml2/2.8.0/lib/libxml2.2.dylib (LoadError)
Referenced from: /usr/local/rvm/gems/ruby-1.9.3-p327/gems/nokogiri-1.6.0/lib/nokogiri/nokogiri.bundle
Reason: Incompatible library version: nokogiri.bundle requires version 11.0.0 or later, but libxml2.2.dylib provides version 10.0.0 - /usr/local/rvm/gems/ruby-1.9.3-p327/gems/nokogiri-1.6.0/lib/nokogiri/nokogiri.bundle
from /usr/local/rvm/gems/ruby-1.9.3-p327/gems/nokogiri-1.6.0/lib/nokogiri.rb:28:in `<top (required)>'
...