Compass手表之前对我来说很好，然后突然间，我发现了这个错误。指南针编译工作正常。我尝试重新安装gem，但我仍然遇到同样的错误。
LoadError on line ["70"] of /home/will/.rvm/gems/ruby-1.9.3-p448/gems/compass-0.12.2/lib/compass/commands/watch_project.rb: cannot load such file -- fssm
Run with --trace to see the full backtrace
will@will-System-Product-Name:/var/www/funandgames/angcomx/public$ compass watch --trace
LoadError on line ["70"] of /home/will/.rvm/gems/ruby-1.9.3-p448/gems/compass-0.12.2/lib/compass/commands/watch_project.rb: cannot load such file -- fssm
/home/will/.rvm/gems/ruby-1.9.3-p448/gems/compass-0.12.2/lib/compass/commands/watch_project.rb:70:in `perform'
/home/will/.rvm/gems/ruby-1.9.3-p448/gems/compass-0.12.2/lib/compass/commands/base.rb:18:in `execute'
/home/will/.rvm/gems/ruby-1.9.3-p448/gems/compass-0.12.2/lib/compass/commands/project_base.rb:19:in `execute'
/home/will/.rvm/gems/ruby-1.9.3-p448/gems/compass-0.12.2/lib/compass/exec/sub_command_ui.rb:43:in `perform!'
/home/will/.rvm/gems/ruby-1.9.3-p448/gems/compass-0.12.2/lib/compass/exec/sub_command_ui.rb:15:in `run!'
/home/will/.rvm/gems/ruby-1.9.3-p448/gems/compass-0.12.2/bin/compass:30:in `block in <top (required)>'
/home/will/.rvm/gems/ruby-1.9.3-p448/gems/compass-0.12.2/bin/compass:44:in `call'
/home/will/.rvm/gems/ruby-1.9.3-p448/gems/compass-0.12.2/bin/compass:44:in `<top (required)>'
我尝试了gem install fssm，以及其他一些在线提出类似错误的解决方案，到目前为止还没有任何效果。
我正在使用ubuntu。