$ rails s
C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/resolver.rb:396:in `block in verify_gemfile_dependencies_are_found!': Could not find gem ‘uglifier (>= 1.3.0) x86-mingw32’ in any of the gem sources listed in your Gemfile. (Bundler::GemNotFound)
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/resolver.rb:366:in `each’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/resolver.rb:366:in `verify_gemfile_dependencies_are_found!’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/resolver.rb:212:in `start’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/resolver.rb:191:in `resolve’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/definition.rb:235:in `resolve’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/definition.rb:159:in `specs’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/definition.rb:218:in `specs_for’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/definition.rb:207:in `requested_specs’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:109:in `block in definition_method’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:21:in `setup’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler.rb:101:in `setup’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.15.3/lib/bundler/setup.rb:19:in `<top (required)>’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:127:in `require’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:127:in `rescue in require’
from C:/RailsInstaller/Ruby2.3.3/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:40:in `require’
from C:/Sites/simpleblog/config/boot.rb:3:in `<top (required)>’
from bin/rails:3:in `require_relative’
from bin/rails:3:in `’