Sass error

sass error

tom@tom-Satellite-A105:~/Documents/Sass_comp_test$ compass create myproject -r susy -u susy --trace
identical myproject/sass/screen.scss 
identical myproject/sass/print.scss 
identical myproject/sass/ie.scss 
WARNING on line 48:
This selector doesn't have any properties and will not be rendered.
WARNING on line 49:
This selector doesn't have any properties and will not be rendered.
WARNING on line 50:
This selector doesn't have any properties and will not be rendered.
WARNING on line 51:
This selector doesn't have any properties and will not be rendered.
WARNING on line 52:
This selector doesn't have any properties and will not be rendered.
WARNING on line 53:
This selector doesn't have any properties and will not be rendered.
WARNING on line 54:
This selector doesn't have any properties and will not be rendered.
WARNING on line 55:
This selector doesn't have any properties and will not be rendered.
WARNING on line 56:
This selector doesn't have any properties and will not be rendered.
Sass::SyntaxError on line 70 of (sass): Invalid property: ":color= !font_color".
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:543:in `parse_line'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:456:in `build_tree'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:475:in `append_children'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:474:in `each'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:474:in `append_children'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:465:in `build_tree'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:458:in `each'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:458:in `build_tree'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:475:in `append_children'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:474:in `each'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:474:in `append_children'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:330:in `_to_tree'
  /usr/lib/ruby/gems/1.8/gems/sass-3.1.12/lib/sass/../sass/engine.rb:259:in `to_tree'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/installers/base.rb:102:in `install_stylesheet'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/installers/manifest_installer.rb:39:in `send'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/installers/manifest_installer.rb:39:in `install'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/installers/manifest.rb:112:in `each'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/installers/manifest.rb:112:in `each'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/installers/manifest_installer.rb:38:in `install'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/installers/base.rb:33:in `run'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/commands/stamp_pattern.rb:75:in `perform'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/commands/base.rb:18:in `execute'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/commands/project_base.rb:19:in `execute'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/exec/sub_command_ui.rb:43:in `perform!'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/lib/compass/exec/sub_command_ui.rb:15:in `run!'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/bin/compass:25
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/bin/compass:39:in `call'
  /usr/lib/ruby/gems/1.8/gems/compass-0.11.6/bin/compass:39
  /usr/bin/compass:19:in `load'
  /usr/bin/compass:19