uninitialized constant Spree::Admin::SupplierTaxonsController::Taxon

[rietta]

Using Rails 3.1.4 and the latest install of the spree gem.

Including spree_suppliers through
gem 'spree_suppliers', :git => 'git://github.com/johndavid400/spree_suppliers.git', :branch => '1.0'

Fresh deploy. Run db:migrate, seed, and spree_sample:load.

Edit a Supplier, clicking Taxons results in this error:

uninitialized constant Spree::Admin::SupplierTaxonsController::Taxon

on http://localhost:3000/admin/suppliers/1/taxons/selected

What am I missing?

Thanks!