ruby on rails 3 - Putting require 'spec_helper' results in Bad URI error -

i did rails generate rspec:install, ran rake spec , works fine.

however, when create new spec file , add require 'spec_helper', following error.

rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/uri/common.rb:176:in `split': bad uri(is not uri?):  (uri::invalidurierror) 

anyone know might issue?

edit: also, when run rake db:schema:load rails_env=test

uri::invalidurierror: bad uri(is not uri?): 

maybe, has raven sentry?

raven dependency causing issue.