Sprockets encoding trace

Gemfile.lock

GEM
  remote: http://rubygems.org/
  specs:
    actionmailer (3.1.0.rc1)
      actionpack (= 3.1.0.rc1)
      mail (~> 2.3.0)
    actionpack (3.1.0.rc1)
      activemodel (= 3.1.0.rc1)
      activesupport (= 3.1.0.rc1)
      builder (~> 3.0.0)
      erubis (~> 2.7.0)
      i18n (~> 0.6.0beta1)
      rack (~> 1.3.0.beta2)
      rack-cache (~> 1.0.1)
      rack-mount (~> 0.8.1)
      rack-test (~> 0.6.0)
      sprockets (~> 2.0.0.beta.5)
      tzinfo (~> 0.3.27)
    activemodel (3.1.0.rc1)
      activesupport (= 3.1.0.rc1)
      bcrypt-ruby (~> 2.1.4)
      builder (~> 3.0.0)
      i18n (~> 0.6.0beta1)
    activerecord (3.1.0.rc1)
      activemodel (= 3.1.0.rc1)
      activesupport (= 3.1.0.rc1)
      arel (~> 2.1.1)
      tzinfo (~> 0.3.27)
    activeresource (3.1.0.rc1)
      activemodel (= 3.1.0.rc1)
      activesupport (= 3.1.0.rc1)
    activesupport (3.1.0.rc1)
      multi_json (~> 1.0)
    arel (2.1.1)
    bcrypt-ruby (2.1.4)
    builder (3.0.0)
    calc (1.0.0)
    cancan (1.6.4)
    coffee-script (2.2.0)
      coffee-script-source
      execjs
    coffee-script-source (1.1.1)
    erubis (2.7.0)
    execjs (1.0.0)
      multi_json (~> 1.0)
    has_scope (0.5.0)
    hike (1.0.0)
    i18n (0.6.0)
    inherited_resources (1.2.2)
      has_scope (~> 0.5.0)
      responders (~> 0.6.0)
    jquery-rails (1.0.9)
      railties (~> 3.0)
      thor (~> 0.14)
    json (1.5.1)
    mail (2.3.0)
      i18n (>= 0.4.0)
      mime-types (~> 1.16)
      treetop (~> 1.4.8)
    mime-types (1.16)
    multi_json (1.0.3)
    mysql2 (0.3.2)
    pg (0.11.0)
    polyglot (0.3.1)
    rack (1.3.0)
    rack-cache (1.0.2)
      rack (>= 0.4)
    rack-mount (0.8.1)
      rack (>= 1.0.0)
    rack-ssl (1.3.2)
      rack
    rack-test (0.6.0)
      rack (>= 1.0)
    rails (3.1.0.rc1)
      actionmailer (= 3.1.0.rc1)
      actionpack (= 3.1.0.rc1)
      activerecord (= 3.1.0.rc1)
      activeresource (= 3.1.0.rc1)
      activesupport (= 3.1.0.rc1)
      bundler (~> 1.0)
      railties (= 3.1.0.rc1)
    railties (3.1.0.rc1)
      actionpack (= 3.1.0.rc1)
      activesupport (= 3.1.0.rc1)
      rack-ssl (~> 1.3.2)
      rake (>= 0.8.7)
      thor (~> 0.14.6)
    rake (0.9.0)
    responders (0.6.4)
    sass (3.1.1)
    sprockets (2.0.0.beta.8)
      hike (~> 1.0)
      rack (~> 1.0)
      tilt (!= 1.3.0, ~> 1.1)
    therubyracer-heroku (0.8.1.pre3)
    thor (0.14.6)
    tilt (1.3.2)
    treetop (1.4.9)
      polyglot (>= 0.3.1)
    tzinfo (0.3.27)
    uglifier (0.5.4)
      execjs (>= 0.3.0)
      multi_json (>= 1.0.2)

PLATFORMS
  ruby

DEPENDENCIES
  calc
  cancan
  coffee-script
  inherited_resources
  jquery-rails
  json
  mysql2
  pg
  rails (= 3.1.0.rc1)
  sass
  therubyracer-heroku (= 0.8.1.pre3)
  uglifier

trace.log

$rake assets:precompile RAILS_ENV=production --trace
** Invoke assets:precompile (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute assets:precompile
rake aborted!
U+25BA from UTF-8 to ISO-8859-1
  (in /Users/amw/Dropbox/Projects/expenses/vendor/assets/javascripts/raphael.min.js)
/opt/local/lib/ruby1.9/gems/1.9.1/gems/sprockets-2.0.0.beta.8/lib/sprockets/context.rb:85:in `rescue in block in evaluate'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/sprockets-2.0.0.beta.8/lib/sprockets/context.rb:81:in `block in evaluate'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/sprockets-2.0.0.beta.8/lib/sprockets/context.rb:80:in `each'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/sprockets-2.0.0.beta.8/lib/sprockets/context.rb:80:in `evaluate'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/sprockets-2.0.0.beta.8/lib/sprockets/bundled_asset.rb:39:in `source'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/sprockets-2.0.0.beta.8/lib/sprockets/bundled_asset.rb:49:in `digest'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/sprockets-2.0.0.beta.8/lib/sprockets/static_compilation.rb:27:in `block (2 levels) in precompile'
/opt/local/lib/ruby1.9/1.9.1/set.rb:222:in `block in each'
/opt/local/lib/ruby1.9/1.9.1/set.rb:222:in `each_key'
/opt/local/lib/ruby1.9/1.9.1/set.rb:222:in `each'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/sprockets-2.0.0.beta.8/lib/sprockets/static_compilation.rb:19:in `block in precompile'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/sprockets-2.0.0.beta.8/lib/sprockets/static_compilation.rb:18:in `each'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/sprockets-2.0.0.beta.8/lib/sprockets/static_compilation.rb:18:in `precompile'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/railties-3.1.0.rc1/lib/rails/tasks/assets.rake:8:in `block (2 levels) in <top (required)>'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/task.rb:205:in `call'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/task.rb:205:in `block in execute'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/task.rb:200:in `each'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/task.rb:200:in `execute'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/opt/local/lib/ruby1.9/1.9.1/monitor.rb:201:in `mon_synchronize'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/task.rb:151:in `invoke_with_call_chain'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/task.rb:144:in `invoke'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/application.rb:112:in `invoke_task'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/application.rb:90:in `block (2 levels) in top_level'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/application.rb:90:in `each'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/application.rb:90:in `block in top_level'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/application.rb:129:in `standard_exception_handling'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/application.rb:84:in `top_level'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/application.rb:62:in `block in run'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/application.rb:129:in `standard_exception_handling'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/lib/rake/application.rb:59:in `run'
/opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.9.0/bin/rake:31:in `<top (required)>'
/opt/local/bin/rake:19:in `load'
/opt/local/bin/rake:19:in `<main>'
Tasks: TOP => assets:precompile

I'm wondering how you solved it, have the same problem:

/Volumes/lokal/Users/skr/.rvm/rubies/ruby-1.9.3-p448/bin/ruby /Volumes/lokal/Users/skr/.rvm/gems/ruby-1.9.3-p448/bin/rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets
rake aborted!
U+201C from UTF-8 to ISO-8859-1
  (in /Volumes/lokal/Users/skr/src/leitstand/app/assets/javascripts/application.js)
/Volumes/lokal/Users/skr/.rvm/gems/ruby-1.9.3-p448/gems/uglifier-2.2.1/lib/uglifier.rb:91:in `read'
/Volumes/lokal/Users/skr/.rvm/gems/ruby-1.9.3-p448/gems/uglifier-2.2.1/lib/uglifier.rb:91:in `initialize'
/Volumes/lokal/Users/skr/.rvm/gems/ruby-1.9.3-p448/gems/actionpack-3.2.6/lib/sprockets/compressors.rb:32:in `new'
/Volumes/lokal/Users/skr/.rvm/gems/ruby-1.9.3-p448/gems/actionpack-3.2.6/lib/sprockets/compressors.rb:32:in `registered_js_compressor'
/Volumes/lokal/Users/skr/.rvm/gems/ruby-1.9.3-p448/gems/actionpack-3.2.6/lib/sprockets/bootstrap.rb:18:in `block in run'
/Volumes/lokal/Users/skr/.rvm/gems/ruby-1.9.3-p448/gems/actionpack-3.2.6/lib/sprockets/compressors.rb:80:in `call'
/Volumes/lokal/Users/skr/.rvm/gems/ruby-1.9.3-p448/gems/actionpack-3.2.6/lib/sprockets/compressors.rb:80:in `compressor'
/Volumes/lokal/Users/skr/.rvm/gems/ruby-1.9.3-p448/gems/actionpack-3.2.6/lib/sprockets/compressors.rb:74:in `compress'
/Volumes/lokal/Users/skr/.rvm/gems/ruby-1.9.3-p448/gems/sprockets-2.1.3/lib/sprockets/processing.rb:265:in `block in js_compressor='