Color is not a module
/usr/lib/ruby/gems/1.8/gems/color-1.4.0/lib/color.rb:19

Gems installed in application:
pdf-writer 1.1.8 + color 1.4.0 + color-tools 1.3.0
can happen to any pdf-writer version and in any OS (tested on XP/
Ubuntu/Debian/FreeBSD)

I have two models:

require 'pdf/writer'
require 'pdf/writer/graphics'
require 'pdf/simpletable'
class ModelA < ActiveRecord::Base
end
In this model i generate pdf's.

AND:
require 'RMagick'
include Magick
require 'rvg/rvg'
class ModelB < ActiveRecord::Base
end
And in this model i generate images's.

Problem are raised when i added ModelB rmagick support.
I was unable to use pdf generator(ModelA) as well as ModelB.

After some research i found that if i remove requires from ONE OF
model, other model is working well ....

Temporary i removed ModelB requirements (generating images from
another place).
Looking for solution ..
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