Archive for September 19, 2011

Rails 3.1 "rails server" error Could not find a JavaScript runtime

September 19, 2011

This post was originally published in the Rambling Labs Blog on September 19, 2011.

I upgraded to rails 3.1.0 and created a new ‘test_app’.
```
rails new test_app
```
Got into the directory. Everything was fine, until I tried to run:
```
rails server
```
It threw a weird error:
```
Could not find a JavaScript runtime.
See https://github.com/sstephenson/execjs for a list of available runtimes.
```
That’s kinda weird. What does a rails app have to do with any JavaScript runtime? I guess it’s support for something that I still don’t know anything about.

I googled that and found a stackoverflow question. So, two solutions for the issue: either*** install nodejs*** or include “gem ‘execjs’” and “gem ‘therubyracer’” in the Gemfile and run bundle install.

Pick…
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