Tilt Erubis dependency

example.rb

require 'bundler/setup'
require 'erb'
require 'tilt'

Tilt.new 'template.erb'

Gemfile

source 'https://rubygems.org'

gem 'tilt', '~> 2.0'

output.txt

% ruby example.rb
/Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/erubis.rb:2:in `require': cannot load such file -- erubis (LoadError)
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/erubis.rb:2:in `<top (required)>'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:259:in `const_defined?'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:259:in `block in constant_defined?'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:258:in `each'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:258:in `inject'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:258:in `constant_defined?'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:224:in `block in lazy_load'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:223:in `each'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:223:in `lazy_load'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:214:in `lookup'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:152:in `[]'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt/mapping.rb:135:in `new'
	from /Users/luca/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/tilt-2.0.0/lib/tilt.rb:43:in `new'
	from example.rb:5:in `<main>'

template.erb

<h1>Hello, World!</h1>

I had the same problem. I solve it by changing require tilt to require tilt/erb