[HELP] Error cannot load (or bundle) 'pg' gem on local windows 7 Ruby on Rails

[Ivan Wang]

I posted a question on SO, but no one answered so far.
http://stackoverflow.com/questions/17221522/error-cannot-load-pg-gem-on-local-windows-7-ruby-on-rails

I just started to learn ruby on rails. I have pg gem installed. And 'pg'
is in both gemfile.lock and gemfile. However, it keep
getting error, "gem is not loaded, Add gem 'pg' to your Gemfile."

I also have tried follow someone's advice, delete the gemfile.lock and
re-bundle. same error came out.

Please look at the link above for details.

Thanks in advanced.

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