css

/*
Syntax error: An @import loop has been found: /Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/zurb-foundation-3.2.5/lib/../scss/foundation/functions/modular-scale.scss imports itself
        on line 3 of /Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/zurb-foundation-3.2.5/lib/../scss/foundation/functions/modular-scale.scss
        from line 3 of /Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/zurb-foundation-3.2.5/lib/../scss/foundation/functions/modular-scale.scss

1: // Legacy support since modular scale
2: // used to reside directly within Foundation
3: @import "modular-scale";

Backtrace:
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/zurb-foundation-3.2.5/lib/../scss/foundation/functions/modular-scale.scss:3
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/zurb-foundation-3.2.5/lib/../scss/foundation/functions/modular-scale.scss:3
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:437:in `handle_import_loop!'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:221:in `visit_import'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/base.rb:37:in `visit'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:100:in `visit'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:227:in `block in visit_import'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:227:in `map'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:227:in `visit_import'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/base.rb:37:in `visit'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:100:in `visit'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/base.rb:53:in `block in visit_children'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/base.rb:53:in `map'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/base.rb:53:in `visit_children'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:109:in `block in visit_children'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:121:in `with_environment'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:108:in `visit_children'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/base.rb:37:in `block in visit'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:128:in `visit_root'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/base.rb:37:in `visit'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:100:in `visit'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/visitors/perform.rb:7:in `visit'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/tree/root_node.rb:20:in `render'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/engine.rb:315:in `_render'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/engine.rb:262:in `render'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/plugin/compiler.rb:341:in `update_stylesheet'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/plugin/compiler.rb:203:in `block in update_stylesheets'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/plugin/compiler.rb:201:in `each'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/plugin/compiler.rb:201:in `update_stylesheets'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/plugin.rb:81:in `update_stylesheets'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/plugin.rb:54:in `check_for_updates'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/sass-3.2.6/lib/sass/plugin/rack.rb:51:in `call'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib/rack/lint.rb:49:in `_call'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib/rack/lint.rb:37:in `call'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib/rack/showexceptions.rb:24:in `call'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib/rack/chunked.rb:43:in `call'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib/rack/content_length.rb:14:in `call'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib/rack/handler/webrick.rb:60:in `service'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
/Users/aitor/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
*/

Estoy teniendo muchos problemas a la hora de compilar un proyecto con zurb-foundation-3.2.5. Continuamente me aparecen los siguientes mensajes:

error sass/app.scss (/Library/Ruby/Gems/2.0.0/gems/modular-scale-1.0.6/lib/modular-scale.rb:118:in `delete_if': can't modify frozen Array)

error /Library/Ruby/Gems/2.0.0/gems/zurb-foundation-3.2.5/scss/foundation.scss (/Library/Ruby/Gems/2.0.0/gems/modular-scale-1.0.6/lib/modular-scale.rb:118:in `delete_if': can't modify frozen Array)

error /Library/Ruby/Gems/2.0.0/gems/zurb-foundation-3.2.5/scss/foundation/functions/modular-scale.scss (Line 3: An @import loop has been found: /Library/Ruby/Gems/2.0.0/gems/zurb-foundation-3.2.5/scss/foundation/functions/modular-scale.scss imports itself)

Gem List muestra lo siguiente:

*** LOCAL GEMS ***

bigdecimal (1.2.0)
capistrano (3.3.5)
capistrano-composer (0.0.5)
capistrano-deepmodules (0.2)
capistrano-stats (1.1.1)
celluloid (0.16.0)
CFPropertyList (2.2.8)
chunky_png (1.3.3, 1.2.7, 1.1.2)
colorize (0.7.5)
compass (1.0.3, 0.12.2, 0.12.1, 0.11.0)
compass-core (1.0.3)
compass-import-once (1.0.5)
ffi (1.9.6)
fssm (0.2.10, 0.2.9, 0.2.7)
hitimes (1.2.2)
i18n (0.7.0)
io-console (0.4.2)
json (1.7.7)
libxml-ruby (2.6.0)
listen (2.8.5)
minitest (4.3.2)
modular-scale (1.0.6)
multi_json (1.10.1)
net-scp (1.2.1)
net-ssh (2.9.2)
nokogiri (1.5.6)
psych (2.0.0)
rake (10.4.2, 10.0.3, 0.9.6)
rb-fsevent (0.9.4)
rb-inotify (0.9.5)
rdoc (4.0.0)
sass (3.4.11, 3.2.5, 3.2.0, 3.1.0)
sassy-math (1.5.1)
sqlite3 (1.3.7)
sshkit (1.6.1)
test-unit (2.0.0.0)
thor (0.19.1)
timers (4.0.1)
zurb-foundation (4.3.2, 3.2.5)

¿Cómo podría solucionarlo?