I installed ruby on rails, postgres. I installed all required gem files, I created a project as http://guides.rubyonrails.org/getting_started.html wants
I added below co
Sounds like your Rakefile
might be missing, or you might not be in the app's "root directory".
cd
to your blog directory, and you should see,
$ ls
app/
bin/
config/
db/
...
If it doesn't exist already, create a new file named Rakefile
and put this text in there.
#!/usr/bin/env rake
# Add your own tasks in files placed in lib/tasks ending in .rake,
# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
require File.expand_path('../config/application', __FILE__)
Blog::Application.load_tasks