title: Bundler could not find compatible versions for gem "tilt":
body: <p>How to fix it?</p>
  
  <pre><code>Bundler could not find compatible versions for gem "tilt":
    In Gemfile:
      sprockets (&gt;= 2.2.1) ruby depends on
        tilt (!= 1.3.0, ~&gt; 1.1) ruby
  
    tilt (2.0.0)
  
  
  (Bundler::VersionConflict)
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler/resolver.rb:130:in `block in resolve'
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler/resolver.rb:128:in `catch'
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler/resolver.rb:128:in `resolve'
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler/definition.rb:179:in `resolve'
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler/definition.rb:114:in `specs'
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler/definition.rb:159:in `specs_for'
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler/definition.rb:148:in `requested_specs'
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler/environment.rb:18:in `requested_specs'
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler/runtime.rb:13:in `setup'
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler.rb:120:in `setup'
  /usr/local/lib/ruby/gems/1.9/gems/bundler-1.3.5/lib/bundler/setup.rb:17:in `&lt;top (required)&gt;'
  /usr/local/lib/ruby/site_ruby/1.9/rubygems/custom_require.rb:60:in `require'
  /usr/local/lib/ruby/site_ruby/1.9/rubygems/custom_require.rb:60:in `rescue in require'
  /usr/local/lib/ruby/site_ruby/1.9/rubygems/custom_require.rb:35:in `require'
  /usr/local/lib/ruby/gems/1.9/gems/passenger-4.0.29/lib/phusion_passenger/loader_shared_helpers.rb:219:in `block in run_load_path_setup_code'
  /usr/local/lib/ruby/gems/1.9/gems/passenger-4.0.29/lib/phusion_passenger/loader_shared_helpers.rb:333:in `running_bundler'
  /usr/local/lib/ruby/gems/1.9/gems/passenger-4.0.29/lib/phusion_passenger/loader_shared_helpers.rb:217:in `run_load_path_setup_code'
  /usr/local/lib/ruby/gems/1.9/gems/passenger-4.0.29/helper-scripts/rack-preloader.rb:96:in `preload_app'
  /usr/local/lib/ruby/gems/1.9/gems/passenger-4.0.29/helper-scripts/rack-preloader.rb:153:in `&lt;module:App&gt;'
  /usr/local/lib/ruby/gems/1.9/gems/passenger-4.0.29/helper-scripts/rack-preloader.rb:29:in `&lt;module:PhusionPassenger&gt;'
  /usr/local/lib/ruby/gems/1.9/gems/passenger-4.0.29/helper-scripts/rack-preloader.rb:28:in `&lt;main&gt;'
  </code></pre>