I posted a question on SO, but no one answered so far.
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.