undefined method `environment' for nil:NilClass when importing Bootstrap into rails

ruby-on-rails ruby-on-rails-4 sass twitter-bootstrap-3

I also met that exact same error after I upgraded rails from 4.0.3 to 4.0.4.

To solve solve this problem, only add

gem "sass-rails", "~> 4.0.2"

to your Gemfile and then

bundle install

Finally restart rails server

Then enjoy your programming in rails 4.0.4

ruby-on-rails ruby-on-rails-4 sass twitter-bootstrap-3

When upgrading to Rails 4.0.5 you need to temporarily lock your sprockets at 2.11.x:

gem 'sprockets', '<= 2.11.0'

Then

bundle install

The exact error I was getting was:

ActionView::Template::Error: undefined method `environment' for nil:NilClass

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