uninitialized constant RAILS_ROOT

[alikapadia]

I am using Rails 3.1. Since my app gives me the error 'undefined local variable or method `init_fb_registration''
I placed gem 'facebook_registration' in my gemfile
I get the following error when i try to start the server

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/ext/module.rb:36:in const_missing': uninitialized constant RAILS_ROOT (NameError) from /Library/Ruby/Gems/1.8/gems/facebook_registration-1.0.3/lib/facebook_registration.rb:26 from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/runtime.rb:68:inrequire'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/runtime.rb:68:in require' from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/runtime.rb:66:ineach'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/runtime.rb:66:in require' from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/runtime.rb:55:ineach'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/runtime.rb:55:in require' from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler.rb:120:inrequire'

I am guessing it has to do with incompatibility of the rails version, can you please let me know if I will be able to use this gem?

[veerasundaravel]

Thanks for sharing the issue and detailed error log. I'l check the issue and post the updates in this thread.

[alvaro-perez-mompean]

Use Rails.root instead of RAILS_ROOT constant.

[reiz]

@apmomp Thanks that worked!

[SohailWAL]

@apmomp thanks man, it worked