Old Rails app: can't find file_column gem?

Hi all

I'm trying to get some old Rails app to work. But when trying to start it, I get the following error:

josh$ script/server => Booting WEBrick... ./script/../config/../config/environment.rb:5: warning: already initialized constant RAILS_ENV /Library/Ruby/Site/1.8/rubygems/custom_require.rb:27:in `gem_original_require': no such file to load -- file_column (MissingSourceFile)   from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:27:in `require'   from ./script/../config/../vendor/rails/activesupport/lib/active_support/dependencies.rb:147:in `require'   from script/../config/../vendor/plugins/file_column/init.rb:5:in `load_plugin'   from ./script/../config/../vendor/rails/railties/lib/initializer.rb:348:in `load_plugin'   from ./script/../config/../vendor/rails/activesupport/lib/active_support/core_ext/kernel/reporting.rb:11:in `silence_warnings'   from ./script/../config/../vendor/rails/railties/lib/initializer.rb:348:in `load_plugin'   from ./script/../config/../vendor/rails/railties/lib/initializer.rb:158:in `load_plugins'   from ./script/../config/../vendor/rails/railties/lib/initializer.rb:158:in `each'    ... 11 levels...   from ./script/../config/../vendor/rails/activesupport/lib/active_support/dependencies.rb:147:in `require'   from ./script/../config/../vendor/rails/railties/lib/commands/server.rb:30   from script/server:3:in `require'   from script/server:3

But I do have the file_column plugin in the vendor/plugins directory! So why is it looking for a gem?

Thanks Josh