acts_as_list plugin not error in production

I'm having an issue where acts_as_list is not being loaded. I have it in my vendor/plugins dir and it works great in dev mode. But after deployment using Capistrano I am getting the following error in production: NameError (undefined local variable or method `acts_as_list' (full error: ). I have verified that the plugins exist in the "current/vendor/plugins" directory on the production server. Any idea why acts_as_list wouldn't work only in that setting?

That subject should have been "acts_as_list plugin error in production" btw.

Success! I didn't realize you had to add git powered plugins as submodules and also add git_enable_submodules to your deploy file.