在我现有的项目中，我改变了
gem "twitter-bootstrap-rails"
至
gem 'bootstrap', '~> 4.1.3'
在我的 Gemfile 中。我现在得到
uninitialized constant ExecJS::Runtimes::RubyRacerRuntime
上线：<%= stylesheet_link_tag "application", :media => "all" %>在app/views/layouts.html.erb
宝石文件：
source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }
ruby '2.5.1'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.0'
# Use mysql as the database for Active Record
gem 'mysql2'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
#gem 'mini_racer', platforms: :ruby
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
#gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.1.0', require: false
gem 'unicorn'
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end
group :development do
# Access an interactive console on exception pages or by calling 'console' anywhere in the code.
gem 'web-console', '>= 3.3.0'
gem 'listen', '>= 3.0.5', '< 3.2'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
gem 'spring-watcher-listen', '~> 2.0.0'
end
group :test do
# Adds support for Capybara system testing and selenium driver
gem 'capybara', '>= 2.15', '< 4.0'
gem 'selenium-webdriver'
# Easy installation and use of chromedriver to run system tests with Chrome
gem 'chromedriver-helper'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
gem 'sidekiq'
gem 'paranoia', '~> 2.2'
gem 'console'
gem 'spreadsheet'
gem 'airbrake', '~> 6.2'
gem 'state_machines'
gem 'state_machines-activerecord'
gem 'devise-i18n'
gem 'devise'
gem 'paper_trail'
gem 'execjs'
gem "therubyracer"
#gem 'sprockets-rails', :require => 'sprockets/railtie'
gem "less-rails" #Sprockets (what Rails 3.1 uses for its asset pipeline) supports LESS
#gem "twitter-bootstrap-rails"
gem 'bootstrap', '~> 4.1.3'
#gem 'bootswatch'
#gem 'jquery-rails'
#gem 'devise-bootstrap-views', '~> 1.0'
#gem "font-awesome-rails"
gem "httparty"
gem "ruby-duration"
gem "jquery-rails"
gem 'webpacker', '~> 3.5'
#gem "spreadsheet"
rake about：
About your application's environment
Rails version 5.2.0
Ruby version 2.5.1-p57 (x86_64-linux)
RubyGems version 2.7.7
Rack version 2.0.5
JavaScript Runtime therubyracer (V8)
Middleware Webpacker::DevServerProxy, Rack::Sendfile, ActionDispatch::Static, ActionDispatch::Executor, ActiveSupport::Cache::Strategy::LocalCache::Middleware, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, RequestStore::Middleware, ActionDispatch::RemoteIp, Sprockets::Rails::QuietAssets, Rails::Rack::Logger, ActionDispatch::ShowExceptions, WebConsole::Middleware, ActionDispatch::DebugExceptions, Airbrake::Rack::Middleware, ActionDispatch::Reloader, ActionDispatch::Callbacks, ActiveRecord::Migration::CheckPending, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ContentSecurityPolicy::Middleware, Rack::Head, Rack::ConditionalGet, Rack::ETag, Rack::TempfileReaper, Warden::Manager
Application root /var/www/app
Environment development
Database adapter mysql2
Database schema version 20180831081336
gem list：
*** LOCAL GEMS ***
actioncable (5.2.1, 5.2.0)
actionmailer (5.2.1, 5.2.0)
actionpack (5.2.1, 5.2.0)
actionview (5.2.1, 5.2.0)
activejob (5.2.1, 5.2.0)
activemodel (5.2.1, 5.2.0)
activerecord (5.2.1, 5.2.0)
activestorage (5.2.1, 5.2.0)
activesupport (5.2.1, 5.2.0)
addressable (2.5.2)
airbrake (6.3.0)
airbrake-ruby (2.11.0)
archive-zip (0.11.0)
arel (9.0.0)
autoprefixer-rails (9.1.3)
bcrypt (3.1.12)
bigdecimal (default: 1.3.4)
bindex (0.5.0)
bootsnap (1.3.1, 1.3.0)
bootstrap (4.1.3)
bootswatch (4.1.3)
builder (3.2.3)
bundler (1.16.4, default: 1.16.2)
byebug (10.0.2)
capybara (3.7.0, 3.3.1)
childprocess (0.9.0)
chromedriver-helper (1.2.0)
cmath (default: 1.0.0)
coffee-rails (4.2.2)
coffee-script (2.4.1)
coffee-script-source (1.12.2)
commonjs (0.2.7)
concurrent-ruby (1.0.5)
connection_pool (2.2.2)
console (0.5)
crass (1.0.4)
csv (default: 1.0.0)
date (default: 1.0.0)
dbm (default: 1.0.0)
devise (4.5.0, 4.4.3)
devise-bootstrap-views (1.1.0)
devise-i18n (1.6.4)
did_you_mean (1.2.0)
erubi (1.7.1)
etc (default: 1.0.0)
execjs (2.7.0)
fcntl (default: 1.0.0)
ffi (1.9.25)
fiddle (default: 1.0.0)
fileutils (default: 1.0.2)
font-awesome-rails (4.7.0.4)
gdbm (default: 2.0.0)
globalid (0.4.1)
httparty (0.16.2)
i18n (1.1.0, 1.0.1)
io-console (default: 0.4.6)
io-like (0.3.0)
ipaddr (default: 1.2.0)
iso8601 (0.12.0)
jbuilder (2.7.0)
jquery-rails (4.3.3)
json (default: 2.1.0)
kgio (2.11.2)
less (2.6.0)
less-rails (2.8.0)
libv8 (3.16.14.19 x86_64-linux)
listen (3.1.5)
loofah (2.2.2)
mail (2.7.0)
marcel (0.3.2)
method_source (0.9.0)
mimemagic (0.3.2)
mini_mime (1.0.1, 1.0.0)
mini_portile2 (2.3.0)
minitest (5.11.3, 5.10.3)
msgpack (1.2.4)
multi_json (1.13.1)
multi_xml (0.6.0)
mysql2 (0.5.2, 0.5.1)
net-telnet (0.1.1)
nio4r (2.3.1)
nokogiri (1.8.4, 1.8.3)
openssl (default: 2.1.0)
orm_adapter (0.5.0)
paper_trail (10.0.1, 9.2.0)
paper_trail-association_tracking (1.0.0)
paranoia (2.4.1)
popper_js (1.14.3)
power_assert (1.1.1)
psych (default: 3.0.2)
public_suffix (3.0.3, 3.0.2)
puma (3.12.0, 3.11.4)
rack (2.0.5)
rack-protection (2.0.3)
rack-proxy (0.6.4)
rack-test (1.1.0, 1.0.0)
rails (5.2.1, 5.2.0)
rails-dom-testing (2.0.3)
rails-html-sanitizer (1.0.4)
railties (5.2.1, 5.2.0)
raindrops (0.19.0)
rake (12.3.1, 12.3.0)
rb-fsevent (0.10.3)
rb-inotify (0.9.10)
rdoc (default: 6.0.1)
redis (4.0.2, 4.0.1)
ref (2.0.0)
request_store (1.4.1)
responders (2.4.0)
ruby-duration (3.2.3)
ruby-ole (1.2.12.1)
ruby_dep (1.5.0)
rubygems-update (2.7.7)
rubyzip (1.2.2, 1.2.1)
sass (3.5.7, 3.5.6)
sass-listen (4.0.0)
sass-rails (5.0.7)
scanf (default: 1.0.0)
sdbm (default: 1.0.0)
selenium-webdriver (3.14.0, 3.13.0)
sidekiq (5.2.1, 5.1.3)
spreadsheet (1.1.8, 1.1.7)
spring (2.0.2)
spring-watcher-listen (2.0.1)
sprockets (3.7.2)
sprockets-rails (3.2.1)
state_machines (0.5.0)
state_machines-activemodel (0.5.1)
state_machines-activerecord (0.5.1)
stringio (default: 0.0.1)
strscan (default: 1.0.0)
test-unit (3.2.7)
therubyracer (0.12.3)
thor (0.20.0)
thread_safe (0.3.6)
tilt (2.0.8)
twitter-bootstrap-rails (4.0.0)
tzinfo (1.2.5)
uglifier (4.1.18, 4.1.13)
unicorn (5.4.1, 5.4.0)
warden (1.2.7)
web-console (3.7.0, 3.6.2)
webpacker (3.5.5)
webrick (default: 1.4.2)
websocket-driver (0.7.0)
websocket-extensions (0.1.3)
xmlrpc (0.3.0)
xpath (3.1.0)
zlib (default: 1.0.0)
你知道如何解决这个问题吗？