How fix error "no such file to load -- RMagick"?

add

gem 'RMagick'

gem "rmagick", "~> 2.13.1"

to your Gemfile and then run

bundle

install

apt-get install libmagick9-dev

first

For those using Heroku:

gem "rmagick", "~>2.13.2", :require => 'RMagick'

Also, include the following wherever you're using it:

require 'RMagick'

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