Ruby on Rails

 my operating system is: windows 7 and my rails version is: 4.2.5.1 and ruby is: ruby 2.1.8p440 (2015-12-16 revision 53160) [i386-mingw32]
whenever i installed nodejs on system this error shows:

D:\rubyproject>gem install nodejs
ERROR:  Could not find a valid gem 'nodejs' (>= 0) in any repository
ERROR:  Possible alternatives: nodes, noderb, modeljs, models, node
what do i do ?
please help me

On Monday, December 14, 2015 at 1:47:09 PM UTC+5:30, Fu Qiang Zhang wrote:

I am new to rails.

After I setup env :

1. created first project with command rails new firstrail

2. Enter demo directory

3. run command rails server

Here, I got the error :

uglifier 2.7.2 was installed. I don't know how to fix this error.

Does any know how to fix this ?

Please help me out, thank you !