这是堆栈跟踪，
$ bundle exec rake --trace
rake aborted!
invalid byte sequence in UTF-8
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:183:in `glob'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:183:in `block in have_rakefile'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:181:in `each'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:181:in `have_rakefile'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:468:in `find_rakefile_location'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:486:in `raw_load_rakefile'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:82:in `block in load_rakefile'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:81:in `load_rakefile'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:65:in `block in run'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/bin/rake:19:in `load'
/home/gautam/.rvm/gems/ruby-1.9.3-p194@global/bin/rake:19:in `<main>'
/home/gautam/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
/home/gautam/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `<main>'
有人知道为什么会这样吗？几天前我更新了我的 Ubuntu 12.04 LTS，这开始发生了。
到目前为止，我已经尝试重新安装 rvm 和 gemsets，重新安装 Postgresql 并在本地安装 node.js，以便 execjs 找到它。