我是Ruby on Rails的新手，我正在尝试使用youtube视频学习它，我已经安装了Heroku，Postgre SQL，Git Bash并尝试运行Rails服务器并收到以下错误。
你们可以帮我解决这个问题吗？ 这里发布了类似的问题，我尝试使用那里提供的解决方案，但它没有用。
试图解开无效的# gem 'therubyracer', platforms: :ruby
人们提到我们需要安装Nodejs，虽然我的系统中有nodejs但是如果安装它我就不使用它，即使我不打算使用它？
请帮我解决这个问题。
$ rails s
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:85:in rescue in block (2 levels) in require': There was an error while trying to load the gem 'uglifier'. (Bundler::GemRequireError)
Gem Load Error is: Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes.
Backtrace for gem load error is:
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/execjs-2.7.0/lib/execjs/runtimes.rb:58:in autodetect'
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/execjs-2.7.0/lib/execjs.rb:5:in <module:ExecJS>'
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/execjs-2.7.0/lib/execjs.rb:4:in'
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/uglifier-4.1.10/lib/uglifier.rb:5:in require'
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/uglifier-4.1.10/lib/uglifier.rb:5:in'
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:82:in require'
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:82:in块（2级）中的require “
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:77:in each'
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:77:in块中的'require'
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:66:in each'
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:66:in require'
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler.rb:108：in require'
c:/Sites/myrubyblog/config/application.rb:7:in'
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:133：在require'
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:133:in块中执行“
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:130:in tap'
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:130:in perform'
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/command.rb:27:in run'
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in invoke_command'
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor.rb:387:in dispatch'
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/command/base.rb:63:in perform'
c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/command.rb:44:in invoke'
c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands.rb:16:in'
bin / rails：4：in require'
bin/rails:4:in'
Bundler Error Backtrace：
来自c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:81:in block (2 levels) in require'
from c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:77:in each'
来自c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:77:in block in require'
from c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:66:in each'
来自c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:66:in require'
from c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler.rb:108:in require'
来自c：/Sites/myrubyblog/config/application.rb:7:in <top (required)>'
from c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:133:in require'
来自c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:133:in block in perform'
from c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:130:in tap'
来自c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:130:in perform'
from c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/command.rb:27:in run'
来自c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in invoke_command'
from c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor.rb:387:in dispatch'
来自c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/command/base.rb:63:in perform'
from c:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/command.rb:44:in invoke'
来自c：/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands.rb:16:in <top (required)>'
from bin/rails:4:in require'
来自bin / rails：4：在''
答案 0 :(得分：0)
错误是“无法找到Javascript运行时”，因为您使用的是Uglifier。
Uglifier是一个JS包装器，需要运行JS运行时。
NodeJS是我的推荐。
答案 1 :(得分：0)
安装NodeJS应该可以解决您的问题。
您可以在此处使用安装程序安装它：https://nodejs.org/en/download/
或者在命令行上使用sudo apt-get install NodeJS或等效项，具体取决于您的系统