# Problem with instructions on GitHub

**URL:** <https://discuss.dradis.com/t/problem-with-instructions-on-github/124>\
**Category:** Community Edition\
**Created:** [April 20, 2015, 3:59pm UTC](https://discuss.dradis.com/t/problem-with-instructions-on-github/124 "2015-04-20T15:59:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![AgoraSecurity](https://avatars.discourse-cdn.com/v4/letter/a/ac8455/32.png) [@AgoraSecurity](https://discuss.dradis.com/u/AgoraSecurity)\
**Post date:** [April 20, 2015, 3:59pm UTC](https://discuss.dradis.com/t/problem-with-instructions-on-github/124/1 "2015-04-20T15:59:48Z")

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Hello,

I’m using an Ubuntu machine.  
I’ve tried to install Dradis through GitHub’s instructions:

> $ git clone [GitHub - dradis/dradis-legacy: This is a LEGACY repo head to](https://github.com/dradis/dradisframework.git)  
> $ cd dradisframework/  
> $ git checkout dradis3\_blackhat-arsenal (change for: git checkout master)  
> $ ruby bin/setup  
> $ bundle exec rails server

And I get an error:  
/home/ubuntu/.rvm/gems/ruby-1.9.3-p551/gems/execjs-2.2.0/lib/execjs/runtimes.rb:51:in `autodetect’: Could not find a JavaScript runtime. See [GitHub - sstephenson/execjs: Run JavaScript code from Ruby](https://github.com/sstephenson/execjs) for a list of available runtimes. (ExecJS::RuntimeUnavailable)

How can I fix that?

Thanks!

**Update:** I’ve edit Gemfile to uncomment line 61: gem ‘execjs’. Then a bundle install, it worked temporarily. When I need to run “RAILS\_ENV=production bundle exec thor dradis:reset” it stop.  
**Update 2:** I’ve edit Gemfile to uncomment line 61 and line 62. It worked

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<div class="post-metadata">

**Author:** ![etd](https://yyz1.discourse-cdn.com/flex035/user_avatar/discuss.dradis.com/etd/32/5_2.png) [@etd](https://discuss.dradis.com/u/etd)\
**Post date:** [April 22, 2015, 7:27am UTC](https://discuss.dradis.com/t/problem-with-instructions-on-github/124/3 "2015-04-22T07:27:17Z")

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Instead of checking out the `dradis3_blackhat-arsenal` branch which no longer exists, please use the `release-3.0` branch.

Quick background info:

- The `execjs` gem is required to **compile** the JS/CSS, this means converting from CoffeeScript and Sass to plain JS/CSS as well as merging multiple files into a single one. Before creating release packages we compile the assets so users don’t have to worry about that.

- However, when running from the Git repo, you’ll default to run in _Development_ mode, which means assets need to be compiled on the fly, and `extjs` needs to be available.

A solution would be to run the code from the Git repo, but in Production mode. This involves:

1. Uncommenting `extjs` in Gemfile and: `$ bundle install`
2. Running: `$ bundle exec rake assets:precompile`
3. Running the server with: `$ RAILS_EN=production bundle exec rails server`