I have a Modular Sinatra app and I'm trying to add the Bootstrap less to the application. get '/bootstrap/application.css' do less :"bootstrap/bootstrap" end I have all less files in views/bootstrap, including bootstrap.less. I get this error: Less::ParseError at /bootstrap/application.css 'reset.less' wasn't found. The first real line of Bootstrap.less is: // CSS Reset @import "reset.less"; I've