sinatra-assetpack

I am trying to get Bootstrap's Less files working with Sinatra AssetPack , but I am getting Less parser errors. These errors lead me believe that the less files being imported through bootstrap.less are not aware of each other. I have an app.rb file: require 'sinatra/base' require 'sinatra/assetpack' class App < Sinatra::Base set :root, File.dirname(__FILE__) register Sinatra::AssetPack assets do css :bootstrap, [ '/css/bootstrap.css' ] end get '/' do erb :index end # start the server if ruby file executed directly run! if app_file == $0 end I've copied all of the Bootstrap less files into the