Rake Command not working after upgrade rails and ruby version?

You can't just upgrade from Rails 2 to 3 without some rather extensive preparation. All hell will break loose. Check out these Railscasts for starters.

I did that , I saw the tutorials from the rails cast website followed the instructions like updated gems etc but still I have received this error.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.