Could not find JavaScript runtime error while doing rails -s

Hello
Iam a new bie in rails and facing problem while running rails server
Iam not able to install my rails properly
Error: Could not find Javascript runtime error
I tried to resolve it by changing the gemfile in my project by
uncommenting
therubyracer in it ,but still the problem is not solved
Please help.

Thanks and Regards
Etika

Install nodejs.


Dheeraj K.