Cannot find Rails symbols in RM 3.1 Follow

I have properly loaded Rails 2.3.8 but I'm seeing a lot of 'Cannot find <SYMBOL>'.  For example, within my controllers I see a lot of warnings:

Cannot find 'before_filter'
Cannot find 'params'
Cannot find 'class_inheritable_accessor'
Cannot find 'redirect_to'
Cannot find 'render'
Cannot find 'Rails'
Cannot find 'fragment_exist?'

Last but not least, I'm using Bundler and I have Gemfile in the root of my project.  Also, I'm using RM 3.1 on Mac OS X 10.6.7.