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Javascript runtime in rails 3.1.0 and ruby ​​1.9.2. do not cope with the hero. Did everything but still not working

Please help, this is my training project. It works locally, but not online:
Hi, they say that I don’t need special gems such as "therubyracer" in rails 3.1.0 but he writes in "hero logs":

    2011-10-04T23:15:30+00:00 app[web.1]: ActionView::Template::Error (Could not fin
d a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of
available runtimes.
2011-10-04T23:15:30+00:00 app[web.1]:   (in /app/app/assets/javascripts/rails.js
)):....

I tried to install therubyracer, but I got an error installing it

C:\proj\lagp>gem install therubyracer
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing therubyracer:
        ERROR: Failed to build gem native extension.

        C:/RailsInstaller/Ruby1.9.2/bin/ruby.exe extconf.rb
checking for main() in -lpthread... no
creating Makefile

make
C:/RailsInstaller/Ruby1.9.2/bin/ruby -e "puts 'EXPORTS', 'Init_v8'"  > v8-i386-m
ingw32.def
g++ -I. -IC:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/libv8-3.3.10.2/li
b/libv8/v8/include -IC:/RailsInstaller/Ruby1.9.2/include/ruby-1.9.1/i386-mingw32.....

I also did compilation: true and precompiled

Here is my github app: https://github.com/EnotPoloskun/lagp . Take a look at plz, if you have time, I spent 2 days for this problem (
so I do not know what to do (,
Thanks in advance

+5
2

Rails 3.1 Heroku , gemfile, :

group :production do
 gem 'therubyracer-heroku'
end

, , ,

+8

group: production do

gem 'therubyracer-heroku'

.

0

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