【发布时间】：2017-11-21 23:48:50
【问题描述】：
当我尝试从我的应用程序目录中使用 rails 命令时，我不断收到以下错误：
/Users/useraccount/.rvm/gems/ruby-2.4.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `load': no implicit conversion of nil into String (TypeError)
这就是我到达那里的方式......
安装和更新所有必要的软件后，我开始进行以下配置：
- Mac OS Sierra 10.12.5
- xcode 8.3.3
- Rails 5.1.1
- ruby 2.4.1p111（2017-03-22 修订版 58053）[x86_64-darwin16]
ruby 2.4.0p0（2016-12-24 修订版 57164）[x86_64-darwin16] - rubygem 2.6.12
- 自制 1.2.3
- Homebrew/homebrew-core（git 修订版 ab5ba7；最后一次提交 2017-06-19）
我进入我的项目文件夹并运行以下内容：
$ rails new testapp
...output omitted...
$ cd testapp
$ rails s
这就是我得到 TypeError 的地方。如果我运行rails -v，它会给我同样的错误。
这是完整的跟踪：
/Users/useraccount/.rvm/gems/ruby-2.4.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `load': no implicit conversion of nil into String (TypeError)
from /Users/useraccount/.rvm/gems/ruby-2.4.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `call'
from /Users/useraccount/.rvm/gems/ruby-2.4.0/gems/spring-2.0.2/lib/spring/client/command.rb:7:in `call'
from /Users/useraccount/.rvm/gems/ruby-2.4.0/gems/spring-2.0.2/lib/spring/client.rb:30:in `run'
from /Users/useraccount/.rvm/gems/ruby-2.4.0/gems/spring-2.0.2/bin/spring:49:in `<top (required)>'
from /Users/useraccount/.rvm/gems/ruby-2.4.0/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `load'
from /Users/useraccount/.rvm/gems/ruby-2.4.0/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `<top (required)>'
from /Users/useraccount/Google Drive Family/code/Rails/12-Week-Challenge/Week_0 [Dry Run]/testapp/bin/spring:15:in `require'
from /Users/useraccount/Google Drive Family/code/Rails/12-Week-Challenge/Week_0 [Dry Run]/testapp/bin/spring:15:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'
更新 1：
我将 ruby 从 2.4.0 升级到 2.4.1，但完全相同的问题仍然存在。
/Users/brianjason/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `load': no implicit conversion of nil into String (TypeError)
更新 2：
当我在 Gemfile 中注释掉 spring 时，应用程序运行时没有错误：
group :development do
# Access an IRB console on exception pages or by using <%= 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
然后我尝试继续开发应用程序。 我按照rails getting started guide
第 4 节中概述的步骤进行操作这是我尝试运行应用程序时得到的结果：
ActionView::Template::Error (bad URI(is not URI?): file:///Users/useraccount/Google%20Drive%20Family/code/Rails/12-Week-Challenge/Week_0%20[Dry%20Run]/testapp/app/assets/stylesheets/application.css?type=text/css&pipeline=debug):
4: <title>Testapp</title>
5: <%= csrf_meta_tags %>
6:
7: <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
8: <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
9: </head>
10:
app/views/layouts/application.html.erb:7:in `_app_views_layouts_application_html_erb___42966888540102183_70217709639480'
【问题讨论】：
-
你是如何安装 Ruby 的？你用的是 RVM 还是 RBENV？
-
RVM。我正在使用最新的稳定版本。
-
你试过
gem uninstall rails然后重新安装了吗？ -
还可以尝试使用 Ruby 2.3.4 或 Ruby 2.4.1 的当前稳定版本。这些可以在这里找到ruby-lang.org/en/downloads
-
我会尝试不同版本的 Ruby。您使用的是 2.4.0p0，Rails 和 Ruby 2.4.0 存在一些问题。
标签： ruby-on-rails ruby ruby-on-rails-5.1