Less hangs Sinatra application - ruby

Question

I am trying to add Bootstrap to a Sinatra application. I have setup routes to compile bootstrap.less and responsive.less. Loading the two stylesheets separately in a web browser works as expected. But when I try to use them in a html page my application hangs. I can only stop the application with kill -9.
It seems that somehow Less imports and multiple stylesheets cause a hang of the application. I was able to isolate the problem:
app.rb
require 'rubygems'
require 'bundler/setup'
require 'sinatra'
require 'less'
get '/' do
haml :index
end
get '/style1.css' do
less :style1, :paths => ['views']
end
get '/style2.css' do
less :style2, :paths => ['views']
end
views/index.haml
!!! 5
%html
%head
%title Hello World
%link{'rel' => 'stylesheet', 'href' => 'style1.css', 'type' => 'text/css'}
%link{'rel' => 'stylesheet', 'href' => 'style2.css', 'type' => 'text/css'}
%body
%h1 Hello World
%p Hello World
views/style1.less
#import "mixins.less";
#import "shadows.less";
#color: #00eeff;
h1 {
color: #color;
}
views/mixins.less
.box-shadow(#shadow) {
-webkit-box-shadow: #shadow;
-moz-box-shadow: #shadow;
box-shadow: #shadow;
}
views/shadows.less
h1 {
.box-shadow(6px 6px 3px #888);
}
views/style2.less
#color: #ccff00;
p {
color: #color;
}
Accessing the index page hangs Sinatra. If I comment out style2.less in the html page or inline shadows.less or mixins.less in style1.less the page loads as expected.
Any idea what could be the problem or how I can debug this further?

Answer 1

I took your files and made small changes to them:
I renamed style2.css to style2.less so i can use Less on it, and eventually download the style2.css with the correct css syntax ---It was not working with the other extension.
And, I told Less that the path to search for directives, was the views path of Sinatra: Less.paths << settings.views.
So, with these changes, the Sinatra application stopped hanging.