I have a simple rails project (ruby 1.9.3, rails 3.2.13), and I am attempting to incorporate the [Gumby CSS Framework](http://gumbyframework.com/). The framework requires [Compass](http://compass-style.org/), with `modular-scale`.

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> *For sake of completeness the majority of the post contains information, skip to the end for the actual problem.*
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The working directory is being watched with

```
$ compass watch`

```

Compass was incorporated into the project with:

```
compass create --app rails \
    -l ./app/assets/stylesheets/gumby/ \
    --using modular-scale

```

The contents of `config/compass.rb` is:

```
require 'modular-scale'
project_type = :rails

```

And the location of Gumby source (SCSS) is `app/assets/stylesheets/gumby`.

The resulting compiled css appears in `public/assets/gumby/gumby.css`.

The following is within my Gemfile

```
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'compass-rails'
  gem 'coffee-rails', '~> 3.2.1'
  gem 'modular-scale'
  gem 'gumby-rails'
  gem 'uglifier', '>= 1.0.3'
end

```

And `bundle install` completes without errors.

**However...**

The following error message appears on all served pages:

Sass::SyntaxError in Users#index
--------------------------------

Showing PROJECT\_ROOT/app/views/layouts/application.html.erb where line #5 raised:

```
File to import not found or unreadable: compass/typography/vertical_rhythm.
Load path: Sass::Rails::Importer(PROJECT_ROOT/app/assets/stylesheets/gumby/_base.scss)
  (in PROJECT_ROOTr/app/assets/stylesheets/gumby/_base.scss)

```

After hours of tinkering, I am at a loss as to the reason why Sass cannot read the Compass library.