When app is deployed with capistrano errors occur in production.log.
Compiled signup.css (30ms) (pid 31797)
Warning. Error encountered while saving cache /home/deployer/apps/example.com/releases/20140315211501/tmp/cache/sass/c76a96d592cb37dc7092a4e2f10ad8d3d22bcc8b/user_sessions.css.scssc: can't dump anonymous class #<Class:0x0000000356d120>
Compiled user_sessions/user_sessions.css (16ms) (pid 31797)
Compiled user_sessions.css (20ms) (pid 31797)
Warning. Error encountered while saving cache /home/deployer/apps/example.com/releases/20140315211501/tmp/cache/sass/a59f84087c66a48b1521281da138ce9e3ed4c217/welcome.css.scssc: can't dump anonymous class #<Class:0x0000000356d120>
This is Gemfile.lock I am using.
GIT
remote: git://github.com/tomazzlender/letter_opener.git
revision: 29b17fefe87b8fdc7ead987dbfabe355b59ff684
specs:
letter_opener (0.0.2)
launchy
GIT
remote: git://github.com/tomazzlender/premailer.git
revision: 88af5e6f60ac78ef1d70d6f0a6f4b7612d2c5f7a
specs:
premailer (1.7.3)
css_parser (>= 1.1.9)
htmlentities (>= 4.0.0)
GIT
remote: git://github.com/tomazzlender/snapshot.git
revision: 0f0f3fd024bf5a3a846e999b845803ae61d870c0
specs:
snapshot (1.1.0)
GIT
remote: https://github.com/37signals/mail_view.git
revision: c8cc1315026ce85973ef56e628ac2e38a7a95563
specs:
mail_view (1.0.1)
tilt
GIT
remote: https://github.com/thoughtbot/capybara-webkit.git
revision: 11c596f7a06dbda123c077440f9275905f89e869
specs:
capybara-webkit (0.13.0)
capybara (>= 2.0.1)
json
GEM
remote: https://rubygems.org/
specs:
actionmailer (3.2.17)
actionpack (= 3.2.17)
mail (~> 2.5.4)
actionpack (3.2.17)
activemodel (= 3.2.17)
activesupport (= 3.2.17)
builder (~> 3.0.0)
erubis (~> 2.7.0)
journey (~> 1.0.4)
rack (~> 1.4.5)
rack-cache (~> 1.2)
rack-test (~> 0.6.1)
sprockets (~> 2.2.1)
active_attr (0.7.0)
activemodel (>= 3.0.2, < 4.1)
activesupport (>= 3.0.2, < 4.1)
activemodel (3.2.17)
activesupport (= 3.2.17)
builder (~> 3.0.0)
activerecord (3.2.17)
activemodel (= 3.2.17)
activesupport (= 3.2.17)
arel (~> 3.0.2)
tzinfo (~> 0.3.29)
activeresource (3.2.17)
activemodel (= 3.2.17)
activesupport (= 3.2.17)
activesupport (3.2.17)
i18n (~> 0.6, >= 0.6.4)
multi_json (~> 1.0)
addressable (2.2.7)
ansi (1.4.3)
arel (3.0.3)
authlogic (3.1.0)
activerecord (>= 3.0.7)
activerecord (>= 3.0.7)
builder (3.0.4)
capistrano (2.9.0)
highline
net-scp (>= 1.0.0)
net-sftp (>= 2.0.0)
net-ssh (>= 2.0.14)
net-ssh-gateway (>= 1.1.0)
capybara (2.0.2)
mime-types (>= 1.16)
nokogiri (>= 1.3.3)
rack (>= 1.0.0)
rack-test (>= 0.5.4)
selenium-webdriver (~> 2.0)
xpath (~> 1.0.0)
childprocess (0.3.6)
ffi (~> 1.0, >= 1.0.6)
chronic (0.6.7)
coffee-rails (3.2.2)
coffee-script (>= 2.2.0)
railties (~> 3.2.0)
coffee-script (2.2.0)
coffee-script-source
execjs
coffee-script-source (1.2.0)
css_parser (1.2.6)
addressable
rdoc
erubis (2.7.0)
eventmachine (1.0.0)
exception_notification (3.0.0)
actionmailer (>= 3.0.4)
tinder (~> 1.8)
execjs (1.3.0)
multi_json (~> 1.0)
faraday (0.8.4)
multipart-post (~> 1.1)
faraday_middleware (0.9.0)
faraday (>= 0.7.4, < 0.9)
ffi (1.2.0)
hashie (1.2.0)
highline (1.6.11)
hike (1.2.3)
htmlentities (4.3.1)
http_parser.rb (0.5.3)
i18n (0.6.9)
journey (1.0.4)
jquery-rails (2.0.3)
railties (>= 3.1.0, < 5.0)
thor (~> 0.14)
json (1.8.1)
kgio (2.7.2)
launchy (2.1.0)
addressable (~> 2.2.6)
libwebsocket (0.1.7.1)
addressable
websocket
mail (2.5.4)
mime-types (~> 1.16)
treetop (~> 1.4.8)
marginalia (1.1.0)
actionpack (>= 2.3, < 3.3)
activerecord (>= 2.3, < 3.3)
meta_request (0.2.1)
rack-contrib
rails
mime-types (1.25.1)
minitest (4.3.3)
minitest-capybara (0.1.0)
capybara (>= 1.0)
minitest-matchers (>= 1.2)
minitest-matchers (1.2.0)
minitest (>= 2.5.0)
minitest-rails (0.3)
minitest (~> 4.0)
rails (~> 3.0)
minitest-rails-capybara (0.1)
minitest-capybara (~> 0.1)
minitest-rails (~> 0.1)
multi_json (1.9.0)
multipart-post (1.1.5)
net-scp (1.0.4)
net-ssh (>= 1.99.1)
net-sftp (2.0.5)
net-ssh (>= 2.0.9)
net-ssh (2.3.0)
net-ssh-gateway (1.1.0)
net-ssh (>= 1.99.1)
nokogiri (1.5.0)
pg (0.17.1)
polyglot (0.3.4)
premailer-rails3 (1.3.1)
premailer (~> 1.7)
rails (~> 3)
psych (1.3.4)
quiet_assets (1.0.1)
railties (~> 3.1)
rack (1.4.5)
rack-cache (1.2)
rack (>= 0.4)
rack-contrib (1.1.0)
rack (>= 0.9.1)
rack-ssl (1.3.3)
rack
rack-test (0.6.2)
rack (>= 1.0)
rails (3.2.17)
actionmailer (= 3.2.17)
actionpack (= 3.2.17)
activerecord (= 3.2.17)
activeresource (= 3.2.17)
activesupport (= 3.2.17)
bundler (~> 1.0)
railties (= 3.2.17)
railties (3.2.17)
actionpack (= 3.2.17)
activesupport (= 3.2.17)
rack-ssl (~> 1.3.2)
rake (>= 0.8.7)
rdoc (~> 3.4)
thor (>= 0.14.6, < 2.0)
raindrops (0.8.0)
rake (10.1.1)
rdoc (3.12.2)
json (~> 1.4)
ruby-ole (1.2.11.3)
rubyzip (0.9.6.1)
sass (3.2.6)
sass-rails (3.2.6)
railties (~> 3.2.0)
sass (>= 3.1.10)
tilt (~> 1.3)
selenium-webdriver (2.27.2)
childprocess (>= 0.2.5)
libwebsocket (~> 0.1.3)
multi_json (~> 1.0)
rubyzip
sheets (1.1.0)
nokogiri (>= 1.4.3.1)
rubyzip (>= 0.9.4)
spreadsheet (>= 0.6.5.2)
simple_oauth (0.1.9)
spreadsheet (0.6.8)
ruby-ole (>= 1.0)
sprockets (2.2.2)
hike (~> 1.2)
multi_json (~> 1.0)
rack (~> 1.0)
tilt (~> 1.1, != 1.3.0)
thor (0.18.1)
tilt (1.4.1)
tinder (1.9.1)
eventmachine (>= 0.12.0, < 2)
faraday (~> 0.8)
faraday_middleware (~> 0.8)
hashie (~> 1.0)
json (~> 1.6)
mime-types (~> 1.16)
multi_json (~> 1.0)
multipart-post (~> 1.1)
twitter-stream (~> 0.1)
treetop (1.4.15)
polyglot
polyglot (>= 0.3.1)
turn (0.9.6)
ansi
twitter-stream (0.1.16)
eventmachine (>= 0.12.8)
http_parser.rb (~> 0.5.1)
simple_oauth (~> 0.1.4)
tzinfo (0.3.39)
uglifier (1.2.3)
execjs (>= 0.3.0)
multi_json (>= 1.0.2)
unicode_utils (1.3.0)
unicorn (4.2.0)
kgio (~> 2.6)
rack
raindrops (~> 0.7)
websocket (1.0.6)
whenever (0.7.3)
activesupport (>= 2.3.4)
chronic (~> 0.6.3)
will_paginate (3.0.3)
xpath (1.0.0)
nokogiri (~> 1.3)
PLATFORMS
ruby
DEPENDENCIES
active_attr
authlogic
capistrano
capybara
capybara-webkit!
coffee-rails (~> 3.2.1)
exception_notification (= 3.0.0)
jquery-rails (~> 2.0.1)
launchy
letter_opener!
mail_view!
marginalia
meta_request (= 0.2.1)
minitest-rails
minitest-rails-capybara
nokogiri
pg
premailer!
premailer-rails3
psych
quiet_assets
rails (= 3.2.17)
sass (= 3.2.6)
sass-rails (~> 3.2.3)
sheets
snapshot!
turn
uglifier (>= 1.0.3)
unicode_utils
unicorn
whenever
will_paginate
What causes this errors?
It is a known bug with the current release of Sass, updating the sass stylesheet will cause the caching error because of the Sprockets importer not serializing correctly. For the bug report see this.
It is a bug in sprockets, but if, like me you are using an older version of Rails (3.2) you may be able to fix the bug by using a different version of sass. This guy was able to get it working with sass 3.1.x: https://github.com/rails/sass-rails/issues/242#issuecomment-66231135
The thread mentioned there gives some good context and an explanation for how to handle solving the issue or working around an inability to upgrade to a much newer, fixed version of sprockets.
Basically, use sass/sass-rails/sprockets from around the time Rails 3.2.x was supported.
来源：https://stackoverflow.com/questions/22431367/warning-error-encountered-while-saving-cache-cant-dump-anonymous-class