Application error heroku, ruby on rails tutorial -

i following ruby on rails tutorial(recomended here on stack:) ) loved far can't seem deploy application via heroku. can give me light on do?

2015-07-23t23:46:37.387879+00:00 heroku[web.1]: process exited status 1 2015-07-23t23:46:37.390702+00:00 heroku[web.1]: state changed starting crashed 2015-07-23t23:46:38.056116+00:00 heroku[router]: at=error code=h10 desc="app crashed" method=get path="/?_c9_id=livepreview7&_c9_host=https://ide.c9.io" host=vast-shore-9845.herokuapp.com request_id=9bc94d44-685f-4554-9940-fe01f5f8acfc fwd="84.81.77.100" dyno= connect= service= status=503 bytes= 2015-07-23t23:47:04.275534+00:00 heroku[slug-compiler]: slug compilation failed: failed compile ruby app 2015-07-23t23:47:04.275511+00:00 heroku[slug-compiler]: slug compilation started 2015-07-23t23:47:34.243854+00:00 heroku[slug-compiler]: slug compilation started 2015-07-23t23:47:34.243873+00:00 heroku[slug-compiler]: slug compilation failed: failed compile ruby app 2015-07-23t23:47:48.259354+00:00 heroku[router]: at=error code=h10 desc="app crashed" method=get path="/?_c9_id=livepreview7&_c9_host=https://ide.c9.io" host=vast-shore-9845.herokuapp.com request_id=80c80609-252a-4603-adc1-ef8fd3803675 fwd="84.81.77.100" dyno= connect= service= status=503 bytes= 2015-07-23t23:50:42.867239+00:00 heroku[slug-compiler]: slug compilation started 2015-07-23t23:50:42.867266+00:00 heroku[slug-compiler]: slug compilation failed: failed compile ruby app 2015-07-23t23:53:02.818263+00:00 heroku[slug-compiler]: slug compilation started 2015-07-23t23:53:02.818432+00:00 heroku[slug-compiler]: slug compilation finished 2015-07-23t23:53:02.741040+00:00 heroku[api]: deploy cb3c9d8  2015-07-23t23:53:02.741040+00:00 heroku[api]: release v6 created  2015-07-23t23:53:02.845508+00:00 heroku[web.1]: state changed crashed starting 2015-07-23t23:53:07.556502+00:00 heroku[web.1]: starting process command `bin/rails server -p 10779 -e production` 2015-07-23t23:53:11.732808+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass/rails/helpers.rb:11:in `<top (required)>': uninitialized constant sass::script (nameerror) 2015-07-23t23:53:11.732845+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass/rails.rb:8:in `<top (required)>' 2015-07-23t23:53:11.732841+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass/rails.rb:8:in `require' 2015-07-23t23:53:11.732848+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass-rails.rb:1:in `<top (required)>' 2015-07-23t23:53:11.732853+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:76:in `block (2 levels) in require' 2015-07-23t23:53:11.732847+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass-rails.rb:1:in `require' 2015-07-23t23:53:11.732850+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:76:in `require' 2015-07-23t23:53:11.732854+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:72:in `each' 2015-07-23t23:53:11.732856+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:72:in `block in require' 2015-07-23t23:53:11.732857+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `each' 2015-07-23t23:53:11.732864+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler.rb:134:in `require' 2015-07-23t23:53:11.732880+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `tap' 2015-07-23t23:53:11.732878+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `block in server' 2015-07-23t23:53:11.732867+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `require' 2015-07-23t23:53:11.732859+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `require' 2015-07-23t23:53:11.732865+00:00 app[web.1]:    /app/config/application.rb:7:in `<top (required)>' 2015-07-23t23:53:11.732881+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `server' 2015-07-23t23:53:11.732882+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!' 2015-07-23t23:53:11.732884+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>' 2015-07-23t23:53:11.732885+00:00 app[web.1]:    bin/rails:8:in `require' 2015-07-23t23:53:11.732886+00:00 app[web.1]:    bin/rails:8:in `<main>' 2015-07-23t23:53:12.670912+00:00 heroku[web.1]: process exited status 1 2015-07-23t23:53:12.675113+00:00 heroku[web.1]: state changed starting crashed 2015-07-23t23:53:26.378922+00:00 heroku[router]: at=error code=h10 desc="app crashed" method=get path="/favicon.ico" host=vast-shore-9845.herokuapp.com request_id=fcb97d6f-128b-4d2b-b3e8-c2de87eb7e33 fwd="84.81.77.100" dyno= connect= service= status=503 bytes= 2015-07-23t23:53:25.583623+00:00 heroku[router]: at=error code=h10 desc="app crashed" method=get path="/" host=vast-shore-9845.herokuapp.com request_id=00322a0d-ad99-43c9-8c40-090c0459cfba fwd="84.81.77.100" dyno= connect= service= status=503 bytes= 2015-07-23t23:59:48.868798+00:00 heroku[slug-compiler]: slug compilation started 2015-07-23t23:59:48.868814+00:00 heroku[slug-compiler]: slug compilation finished 2015-07-23t23:59:48.811695+00:00 heroku[api]: deploy d7257fd  2015-07-23t23:59:48.811695+00:00 heroku[api]: release v7 created  2015-07-23t23:59:48.962017+00:00 heroku[web.1]: state changed crashed starting 2015-07-23t23:59:53.564068+00:00 heroku[web.1]: starting process command `bundle exec rails server -p 45661` 2015-07-23t23:59:56.828404+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass/rails/helpers.rb:11:in `<top (required)>': uninitialized constant sass::script (nameerror) 2015-07-23t23:59:56.828424+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass/rails.rb:8:in `require' 2015-07-23t23:59:56.828426+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass/rails.rb:8:in `<top (required)>' 2015-07-23t23:59:56.828428+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass-rails.rb:1:in `require' 2015-07-23t23:59:56.828429+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass-rails.rb:1:in `<top (required)>' 2015-07-23t23:59:56.828431+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:76:in `require' 2015-07-23t23:59:56.828435+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:76:in `block (2 levels) in require' 2015-07-23t23:59:56.828437+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:72:in `each' 2015-07-23t23:59:56.828438+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:72:in `block in require' 2015-07-23t23:59:56.828440+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `each' 2015-07-23t23:59:56.828441+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `require' 2015-07-23t23:59:56.828442+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler.rb:134:in `require' 2015-07-23t23:59:56.828444+00:00 app[web.1]:    /app/config/application.rb:7:in `<top (required)>' 2015-07-23t23:59:56.828445+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `require' 2015-07-23t23:59:56.828447+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `block in server' 2015-07-23t23:59:56.828448+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `tap' 2015-07-23t23:59:56.828449+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `server' 2015-07-23t23:59:56.828450+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!' 2015-07-23t23:59:56.828452+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>' 2015-07-23t23:59:56.828453+00:00 app[web.1]:    bin/rails:8:in `require' 2015-07-23t23:59:56.828457+00:00 app[web.1]:    bin/rails:8:in `<main>' 2015-07-23t23:59:57.609465+00:00 heroku[web.1]: state changed starting crashed 2015-07-23t23:59:57.597734+00:00 heroku[web.1]: process exited status 1 2015-07-23t23:59:57.610775+00:00 heroku[web.1]: state changed crashed starting 2015-07-24t00:00:00.487775+00:00 heroku[web.1]: starting process command `bundle exec rails server -p 28996` 2015-07-24t00:00:03.609964+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass/rails/helpers.rb:11:in `<top (required)>': uninitialized constant sass::script (nameerror) 2015-07-24t00:00:03.609994+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass/rails.rb:8:in `require' 2015-07-24t00:00:03.609997+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass/rails.rb:8:in `<top (required)>' 2015-07-24t00:00:03.609998+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass-rails.rb:1:in `require' 2015-07-24t00:00:03.610000+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/sass-rails-5.0.1/lib/sass-rails.rb:1:in `<top (required)>' 2015-07-24t00:00:03.610001+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:76:in `require' 2015-07-24t00:00:03.610003+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:76:in `block (2 levels) in require' 2015-07-24t00:00:03.610004+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:72:in `each' 2015-07-24t00:00:03.610009+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:72:in `block in require' 2015-07-24t00:00:03.610010+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `each' 2015-07-24t00:00:03.610012+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `require' 2015-07-24t00:00:03.610013+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler.rb:134:in `require' 2015-07-24t00:00:03.610014+00:00 app[web.1]:    /app/config/application.rb:7:in `<top (required)>' 2015-07-24t00:00:03.610016+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `require' 2015-07-24t00:00:03.610017+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `block in server' 2015-07-24t00:00:03.610019+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `tap' 2015-07-24t00:00:03.610020+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `server' 2015-07-24t00:00:03.610021+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!' 2015-07-24t00:00:03.610023+00:00 app[web.1]:    /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>' 2015-07-24t00:00:03.610024+00:00 app[web.1]:    bin/rails:8:in `require' 2015-07-24t00:00:03.610026+00:00 app[web.1]:    bin/rails:8:in `<main>' 2015-07-24t00:00:04.345273+00:00 heroku[web.1]: process exited status 1 2015-07-24t00:00:04.356753+00:00 heroku[web.1]: state changed starting crashed 2015-07-24t00:00:09.963238+00:00 heroku[router]: at=error code=h10 desc="app crashed" method=get path="/" host=vast-shore-9845.herokuapp.com request_id=822845f6-3908-4248-a575-814ca10d22d2 fwd="84.81.77.100" dyno= connect= service= status=503 bytes= 2015-07-24t00:00:10.800435+00:00 heroku[router]: at=error code=h10 desc="app crashed" method=get path="/favicon.ico" host=vast-shore-9845.herokuapp.com request_id=873c38e3-d55c-4645-8ac5-97422fa125bb fwd="84.81.77.100" dyno= connect= service= status=503 bytes= 2015-07-24t00:03:43.594872+00:00 heroku[router]: at=error code=h10 desc="app crashed" method=get path="/" host=vast-shore-9845.herokuapp.com request_id=16ab9874-71c4-48f4-9ce8-a20958396716 fwd="84.81.77.100" dyno= connect= service= status=503 bytes= 2015-07-24t00:03:44.334194+00:00 heroku[router]: at=error code=h10 desc="app crashed" method=get path="/favicon.ico" host=vast-shore-9845.herokuapp.com request_id=d21a4989-daab-4363-bcfc-a482c9977a41 fwd="84.81.77.100" dyno= connect= service= status=503 bytes= 2015-07-24t00:06:37.583563+00:00 heroku[router]: at=error code=h10 desc="app crashed" method=get path="/" host=vast-shore-9845.herokuapp.com request_id=f06c025a-ee76-4d4e-aa87-e2c9fa4ddf32 fwd="84.81.77.100" dyno= connect= service= status=503 bytes= 2015-07-24t00:06:38.170649+00:00 heroku[router]: at=error code=h10 desc="app crashed" method=get path="/favicon.ico" host=vast-shore-9845.herokuapp.com request_id=45c72e79-010e-48f5-8859-ff28a299e0ef fwd="84.81.77.100" dyno= connect= service= status=503 bytes= warning: toolbelt v3.40.6 update available. 

the issue gem version 5.0.1 run:

bundle update sass-rails 

which updates saas-rails gem latest one. or can enter version 5.0.2+ in gemfile like

gem 'sass-rails', '5.0.3'