heroku run rake assets:precompile

_ error output

$ heroku run rake -t assets:precompile --app qrious-cedar
Running rake -t assets:precompile attached to terminal... up, run.6
** Invoke assets:precompile (first_time)
** Invoke assets:ensure_env (first_time)
** Execute assets:ensure_env
** Execute assets:precompile
** Invoke environment (first_time)
** Execute environment
Compiled ~/app/assets/javascripts/jquery.form.js  (0ms)  (pid 4)
Compiled ~/app/assets/javascripts/jquery.form.js  (191ms)  (pid 4)
Compiled ~/app/assets/javascripts/jquery.metadata.js  (0ms)  (pid 4)
Compiled ~/app/assets/javascripts/jquery.metadata.js  (111ms)  (pid 4)
Compiled ~/app/assets/javascripts/jquery.tmpl.js  (0ms)  (pid 4)
Compiled ~/app/assets/javascripts/jquery.tmpl.js  (227ms)  (pid 4)
Compiled ~/app/assets/javascripts/knockout-1.1.2.js  (0ms)  (pid 4)
Compiled ~/app/assets/javascripts/knockout-1.1.2.js  (266ms)  (pid 4)
Compiled ~/app/assets/javascripts/jquery.validate.js  (0ms)  (pid 4)
Compiled ~/app/assets/javascripts/jquery.validate.js  (218ms)  (pid 4)
Compiled ~/vendor/bundle/ruby/1.9.1/gems/jquery-rails-1.0.12/vendor/assets/javascripts/jquery-ui.min.js  (1ms)  (pid 4)
Compiled ~/vendor/bundle/ruby/1.9.1/gems/jquery-rails-1.0.12/vendor/assets/javascripts/jquery-ui.min.js  (1272ms)  (pid 4)
Compiled ~/vendor/bundle/ruby/1.9.1/gems/jquery-rails-1.0.12/vendor/assets/javascripts/jquery.min.js  (1ms)  (pid 4)
Compiled ~/vendor/bundle/ruby/1.9.1/gems/jquery-rails-1.0.12/vendor/assets/javascripts/jquery.min.js  (694ms)  (pid 4)
Compiled ~/app/assets/javascripts/application.js  (5ms)  (pid 4)
Compiled ~/vendor/bundle/ruby/1.9.1/gems/jquery-rails-1.0.12/vendor/assets/javascripts/jquery.js  (1ms)  (pid 4)
Compiled ~/vendor/bundle/ruby/1.9.1/gems/jquery-rails-1.0.12/vendor/assets/javascripts/jquery_ujs.js  (0ms)  (pid 4)
Compiled ~/vendor/bundle/ruby/1.9.1/gems/jquery-rails-1.0.12/vendor/assets/javascripts/jquery-ui.js  (1ms)  (pid 4)
Compiled ~/app/assets/javascripts/application/app.js  (0ms)  (pid 4)
Compiled ~/app/assets/javascripts/application.js  (3226ms)  (pid 4)
rake aborted!
undefined method `args=' for [[]]:Sass::Tree::FunctionNode
  (in /app/app/assets/stylesheets/application.css.scss)
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/deep_copy.rb:36:in `visit_function'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/base.rb:37:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/deep_copy.rb:6:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/deep_copy.rb:10:in `block in visit_children'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/deep_copy.rb:10:in `map'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/deep_copy.rb:10:in `visit_children'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/base.rb:39:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/deep_copy.rb:6:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/base.rb:24:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/node.rb:187:in `deep_copy'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/cache_stores/memory.rb:32:in `retrieve'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/cache_stores/chain.rb:25:in `block in retrieve'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/cache_stores/chain.rb:24:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/cache_stores/chain.rb:24:in `each_with_index'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/cache_stores/chain.rb:24:in `retrieve'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/engine.rb:311:in `_to_tree'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/engine.rb:252:in `to_tree'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:144:in `visit_import'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/base.rb:37:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:18:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:145:in `block in visit_import'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:145:in `map'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:145:in `visit_import'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/base.rb:37:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:18:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/base.rb:53:in `block in visit_children'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/base.rb:53:in `map'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/base.rb:53:in `visit_children'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:27:in `block in visit_children'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:39:in `with_environment'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:26:in `visit_children'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/base.rb:37:in `block in visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:47:in `visit_root'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/base.rb:37:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:18:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/visitors/perform.rb:7:in `visit'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/tree/root_node.rb:20:in `render'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/engine.rb:293:in `_render'
/app/vendor/bundle/ruby/1.9.1/gems/sass-3.1.6/lib/sass/engine.rb:240:in `render'
/app/vendor/bundle/ruby/1.9.1/gems/sass-rails-3.1.0.rc.5/lib/sass/rails/template_handlers.rb:75:in `evaluate'
/app/vendor/bundle/ruby/1.9.1/gems/tilt-1.3.2/lib/tilt/template.rb:76:in `render'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/context.rb:176:in `block in evaluate'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/context.rb:173:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/context.rb:173:in `evaluate'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/bundled_asset.rb:165:in `build_dependency_context_and_body'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/bundled_asset.rb:135:in `dependency_context'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/bundled_asset.rb:185:in `build_dependencies_paths_and_assets'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/bundled_asset.rb:141:in `dependency_paths'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/bundled_asset.rb:61:in `mtime'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/asset.rb:58:in `block in encode_with'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/asset.rb:57:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/asset.rb:57:in `encode_with'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/bundled_asset.rb:43:in `encode_with'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/caching.rb:48:in `cache_asset'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/index.rb:68:in `block in build_asset'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/index.rb:77:in `memoize'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/index.rb:66:in `build_asset'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/trail.rb:111:in `find_asset_in_path'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/base.rb:102:in `find_asset'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/index.rb:49:in `find_asset'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/static_compilation.rb:44:in `block (2 levels) in precompile'
/usr/local/lib/ruby/1.9.1/set.rb:222:in `block in each'
/usr/local/lib/ruby/1.9.1/set.rb:222:in `each_key'
/usr/local/lib/ruby/1.9.1/set.rb:222:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/static_compilation.rb:35:in `block in precompile'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/static_compilation.rb:34:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/sprockets-2.0.0.beta.12/lib/sprockets/static_compilation.rb:34:in `precompile'
/app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.1.0.rc5/lib/sprockets/assets.rake:14:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:112:in `invoke_task'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:90:in `block (2 levels) in top_level'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:90:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:90:in `block in top_level'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:84:in `top_level'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:62:in `block in run'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2/bin/rake:32:in `<top (required)>'
/app/vendor/bundle/ruby/1.9.1/bin/rake:19:in `load'
/app/vendor/bundle/ruby/1.9.1/bin/rake:19:in `<main>'
Tasks: TOP => assets:precompile

application.css.scss

// This import applies a global reset to any page that imports this stylesheet.
@import "blueprint/reset";

// To configure blueprint, edit the partials/base.sass file.
@import "partials/theme";
@import "partials/base";

@import "compass";
@import "blueprint/colors";
@import "blueprint/grid";
@import "blueprint/typography";
@import "blueprint/utilities";
@import "blueprint/interaction";
@import "blueprint/debug";
@import "blueprint/print";
@import "blueprint/ie";

@import "partials/mixins";
@import "partials/jquery-ui";
@import "partials/compass_buttons";
@import "partials/buttons";
@import "partials/formtastic";
@import "partials/formtastic_changes";
@import "partials/app";
@import "partials/colorswatch";

application.rb

    # Enable the asset pipeline
    config.assets.enabled = true
    config.sass.load_paths << "#{Gem.loaded_specs['compass'].full_gem_path}/frameworks/compass/stylesheets"
    config.sass.load_paths << "#{Gem.loaded_specs['compass'].full_gem_path}/frameworks/blueprint/stylesheets"

Gemfile

gem 'rails', '3.1.0.rc5'

gem 'thin'
gem 'foreman'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails', "~> 3.1.0.rc"
  gem 'coffee-rails', "~> 3.1.0.rc"
  gem 'uglifier'
  gem 'compass', :git => 'https://github.com/chriseppstein/compass.git', :branch => 'rails31'
  gem 'compass-colors'
  gem 'fancy-buttons'
end

gem 'jquery-rails'

# UI gems
gem "haml"
gem 'html5-boilerplate'

heroku log after a request

2011-08-03T15:55:49+00:00 app[web.1]: ActionView::Template::Error (undefined method `args=' for [[]]:Sass::Tree::FunctionNode
2011-08-03T15:55:49+00:00 app[web.1]:   (in /app/app/assets/stylesheets/application.css.scss)):
2011-08-03T15:55:49+00:00 app[web.1]:     1: -# http://www.google.com/webfonts
2011-08-03T15:55:49+00:00 app[web.1]:     2: -# %link(href='http://fonts.googleapis.com/css?family=Francois+One' rel='stylesheet' type='text/css')
2011-08-03T15:55:49+00:00 app[web.1]:     3: -# %link(href='http://fonts.googleapis.com/css?family=Droid+Sans:regular,bold' rel='stylesheet' type='text/css')
2011-08-03T15:55:49+00:00 app[web.1]:     4: = stylesheet_link_tag 'application'
2011-08-03T15:55:49+00:00 app[web.1]:     5: -# = stylesheet_link_tag 'mobile'
2011-08-03T15:55:49+00:00 app[web.1]:     6: -# = include_stylesheets :application, :media => 'screen, projection'
2011-08-03T15:55:49+00:00 app[web.1]:     7: -# = include_stylesheets :application_print, :media => 'print'
2011-08-03T15:55:49+00:00 app[web.1]:   app/views/layouts/_stylesheets.html.haml:4:in `_app_views_layouts__stylesheets_html_haml___1447666839983285428_64837480'
2011-08-03T15:55:49+00:00 app[web.1]:   app/views/layouts/_head.html.haml:32:in `_app_views_layouts__head_html_haml___3068677772884539672_64976220'
2011-08-03T15:55:49+00:00 app[web.1]:   app/views/layouts/application.html.haml:4:in `block in _app_views_layouts_application_html_haml___1425643352922356698_65693960'
2011-08-03T15:55:49+00:00 app[web.1]:   app/views/layouts/application.html.haml:3:in `_app_views_layouts_application_html_haml___1425643352922356698_65693960'