First rails install: Rake aborted no javascript runtime

Question

I am following a video tutorial for installing rails and after installing rails, gems, and mysql, the video walks through rake db:create as a test to ensure mysql is working correctly.

c:\row\dev\Hello_World>rake db:create
DL is deprecated, please use Fiddle
rake aborted!
Bundler::GemRequireError: There was an error while trying to load the gem 'uglifier'.
c:/row/dev/Hello_World/config/application.rb:7:in `<top (required)>'
c:/row/dev/Hello_World/Rakefile:4:in `<top (required)>'
ExecJS::RuntimeUnavailable: Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes.
c:/row/dev/Hello_World/config/application.rb:7:in `<top (required)>'
c:/row/dev/Hello_World/Rakefile:4:in `<top (required)>'
(See full trace by running task with --trace)

I'm a bit lost. Any help would be appreciated.

since it came up a couple of times in the comments, gem install therubyracer gave this:

ERROR:  Error installing therubyracer:
        ERROR: Failed to build gem native extension.

    c:/row/Ruby21/bin/ruby.exe extconf.rb
creating Makefile
which: no python in (.;c:\row\Ruby21\devkit\bin;c:\row\Ruby21\devkit\mingw\bin;c:\windows;C:\Program Files\MySQL\MySQL Server 5.7\bin;c:\row\Ruby21\bin)
The system cannot find the path specified.
which: no python in (.;c:\row\Ruby21\devkit\bin;c:\row\Ruby21\devkit\mingw\bin;c:\windows;C:\Program Files\MySQL\MySQL Server 5.7\bin;c:\row\Ruby21\bin)
c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13/ext/libv8/builder.rb:81:in `setup_python!': libv8 requires python 2 to be installed in order to build, but it is currently not available (RuntimeError)
        from c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13/ext/libv8/builder.rb:55:in `block in build_libv8!'
        from c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13/ext/libv8/builder.rb:52:in `chdir'
        from c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13/ext/libv8/builder.rb:52:in `build_libv8!'
        from c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:24:in `install!'
        from extconf.rb:7:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13 for inspection.
Results logged to c:/row/Ruby21/lib/ruby/gems/2.1.0/extensions/x86-mingw32/2.1.0/libv8-3.16.14.13/gem_make.out

Alexandr T · Accepted Answer · 2015-12-24 13:21:43Z

1

Try to install therubyracer gem

answered Dec 24, 2015 at 13:21

Alexandr T

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7 Comments

Mike Over a year ago

gem install therubyracer gave me and error that it couldn't find the path specified and it could not find python.

Alexandr T Over a year ago

add gem 'therubyracer', :platforms => :ruby in your Gemfile and run bundle install

Mike Over a year ago

Ok, added that to the gemfile, saved, then ran bundle install. therubyracer does not show up on the list of gems used and it doesn't say it was installed.

Alexandr T Over a year ago

I didn't pay attention that you use Windows. This answer may be useful stackoverflow.com/a/6359265/1998300

Mike Over a year ago

Looks like I don't need therubyracer gem, but its still not clear why I have an error loading uglifier on the rake db:create command.

|

Artur Olenberg · Accepted Answer · 2015-12-24 13:22:45Z

0

Try fix it:

/usr/local/lib/ruby/gems/ruby_ver/gems/execjs-ver/lib/execjs/runtimes.rb

Node = ExternalRuntime.new(
      :name        => "Node.js (V8)",
      :command     => ["nodejs", "/usr/local/bin/node"],
      :runner_path => ExecJS.root + "/support/node_runner.js",
      :encoding    => 'UTF-8'
    )

answered Dec 24, 2015 at 13:22

Artur Olenberg

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5 Comments

Mike Over a year ago

Can you elaborate? I found the execjs runtimes.rb file but its not clear to me what I need to do with it.

Artur Olenberg Over a year ago

@Mike, open it in a text editor and bring the file to a form.

Mike Over a year ago

Neither made any noticeable change.

Artur Olenberg Over a year ago

Try see there: stackoverflow.com/questions/12520456/…

Mike Over a year ago

Ok, some progress now. The runtime error is gone but the uglifier issue is still there. Thanks for sticking with me so far.

Сергій Назаревич · Accepted Answer · 2015-12-24 13:26:39Z

0

As case, You could install node.js into system.

In my AmazonWS AMI EC2 this fix it.

answered Dec 24, 2015 at 13:26

Сергій Назаревич

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3 Comments

Mike Over a year ago

Node.js is installed on my system.

Сергій Назаревич Over a year ago

Such as You use Windows, may be it don't see node.js path and, possible, restart system required...

Сергій Назаревич Over a year ago

...We talk about node.js but not about gem node. May be it is conflict node.js and node gem... You could see nodejs.org for clear install of node.js

vipin · Accepted Answer · 2015-12-24 13:46:33Z

0

Paste it into terminal

gem install therubyracer

INSERT INTO YOUR Gemfile

  gem 'uglifier', '~> 2.7', '>= 2.7.2'

run

bundle install

answered Dec 24, 2015 at 13:46

vipin

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2 Comments

Mike Over a year ago

I am getting an error when I attempt to install therubyracer. I updated the question to include the error text.

vipin Over a year ago

@Mike try to install nodejs

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