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Home/ Questions/Q 7915839
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Editorial Team
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Editorial Team
Asked: June 3, 20262026-06-03T14:35:34+00:00 2026-06-03T14:35:34+00:00

I had Compass 0.12 (a ruby gem) installed on Ubuntu Oneiric with no problems

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I had Compass 0.12 (a ruby gem) installed on Ubuntu Oneiric with no problems I have updated to Precise formatting / and keeping /home, so I needed to reinstall ruby (1.9.3).

I get this error now when I compile a SCSS file:

compass watch --trace

            Change detected at 12:45:09 to: style.scss overwrite css/style.css

Dear developers making use of FSSM in your projects, FSSM is essentially dead at this point. Further development will be taking place in the new shared guard/listen project. Please let us know if you need help transitioning! ^_^b - Travis Tilley

>>> Compass is polling for changes. Press Ctrl-C to Stop.
ArgumentError on line ["46"] of /usr/lib/ruby/1.9.1/pathname.rb: invalid byte sequence in US-ASCII
  /usr/lib/ruby/1.9.1/pathname.rb:46:in `chop_basename'
  /usr/lib/ruby/1.9.1/pathname.rb:102:in `cleanpath_aggressive'
  /usr/lib/ruby/1.9.1/pathname.rb:90:in `cleanpath'
  /usr/lib/ruby/1.9.1/pathname.rb:452:in `relative_path_from'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/path.rb:82:in `split_path'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/path.rb:70:in `run_callback'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/path.rb:56:in `callback_action'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/path.rb:36:in `update'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/state/directory.rb:39:in `block in modified'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/state/directory.rb:37:in `each'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/state/directory.rb:37:in `modified'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/state/directory.rb:18:in `refresh'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/backends/polling.rb:17:in `block (2 levels) in run'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/backends/polling.rb:17:in `each'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/backends/polling.rb:17:in `block in run'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/backends/polling.rb:15:in `loop'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/backends/polling.rb:15:in `run'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm/monitor.rb:26:in `run'
  /var/lib/gems/1.9.1/gems/fssm-0.2.9/lib/fssm.rb:70:in `monitor'
  /var/lib/gems/1.9.1/gems/compass-0.12.1/lib/compass/commands/watch_project.rb:89:in `perform'
  /var/lib/gems/1.9.1/gems/compass-0.12.1/lib/compass/commands/base.rb:18:in `execute'
  /var/lib/gems/1.9.1/gems/compass-0.12.1/lib/compass/commands/project_base.rb:19:in `execute'
  /var/lib/gems/1.9.1/gems/compass-0.12.1/lib/compass/exec/sub_command_ui.rb:43:in `perform!'
  /var/lib/gems/1.9.1/gems/compass-0.12.1/lib/compass/exec/sub_command_ui.rb:15:in `run!'
  /var/lib/gems/1.9.1/gems/compass-0.12.1/bin/compass:29:in `block in <top (required)>'
  /var/lib/gems/1.9.1/gems/compass-0.12.1/bin/compass:43:in `call'
  /var/lib/gems/1.9.1/gems/compass-0.12.1/bin/compass:43:in `<top (required)>'
  /usr/local/bin/compass:19:in `load'
  /usr/local/bin/compass:19:in `<main>'

(The “Dear developers” message is part of the output).

This error doesn’t appear the first time I make a change to the scss file, but the second.

In addition, compass “eats” one “s” in some files and, instead of compiling them as “style.css” (what it should be from the file’s name) it does as “tyle.css”.

I’ve spend 3 hours looking at similar problems here but I couldn’t solve it. I tried including # encoding: utf-8 on the top of some files with no luck.

Please explain step by step what should I do, since I am a total noob with Ruby (I just use it because of SASS).

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  1. Editorial Team
    Editorial Team
    2026-06-03T14:35:36+00:00Added an answer on June 3, 2026 at 2:35 pm

    I think there is some problem with the pathname, maybe it contains an invalid non-ASCII sequence; probably the eaten “s” is the problem, maybe it is an invalid character, or maybe a character near to it; try to ensure path is ASCII.

    Or maybe a bug in precise readline package? Try to install ruby 1.9.3 via RVM, RVM should use readline bundled with it (see the comments below for details)

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