First rails application: routes.rb not leading to right page(?) - ruby-on-rails

Apologies in advance if this is so basic I probbaly shouldn't post it here. I'm not even sure if the title actually describes the issue. I am just starting to look at Ruby on Rails, and am following this page to set up "my first application": http://guides.rubyonrails.org/getting_started.html
Now, when I get to the point where I add
root 'welcome#index'
Into the routes.rb file and try and access it, it all goes wrong. First I thought it was a permissions issue, but I can access the views/layouts/welcome/index.html.erb file directly in the browser.
I'm so new to this that I haven't got far enough to know what I'm looking for in troubleshooting, hence this post.
When starting the rails server, I do get what looks like errors on restart and hangup signals, but I doubt this is the problem. Output listed here just in case.
=> Booting Puma
=> Rails 5.1.2 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
*** SIGUSR2 not implemented, signal based restart unavailable!
*** SIGUSR1 not implemented, signal based restart unavailable!
*** SIGHUP not implemented, signal based logs reopening unavailable!
Puma starting in single mode...
* Version 3.9.1 (ruby 2.3.3-p222), codename: Private Caller
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop
Loading the root page gives the following server output:
Started GET "/" for 127.0.0.1 at 2017-06-28 13:17:23 +0200
Processing by WelcomeController#index as HTML
Rendering welcome/index.html.erb within layouts/application
Rendered welcome/index.html.erb within layouts/application (13.0ms)
Completed 500 Internal Server Error in 3742ms
ActionView::Template::Error (TypeError: Object doesn't support this property or method):
5:
6: <%= csrf_meta_tags %>
7:
8: <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
9: <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
10:
11: </head>
app/views/layouts/application.html.erb:8:in `_app_views_layouts_application_html_erb___750167210_57076860'
It kind of looks to me as though it does load the index page, but then something else triggers and it's redirected to a page that doesn't work. The content of the page it's directed to (views/layouts/application.html.erb) is:
<!DOCTYPE html>
<html>
<head>
<title>Blog</title>
<%= csrf_meta_tags %>
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
<%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
</head>
<body>
<%= yield %>
</body>
</html>
Content of routes.rb for reference is:
Rails.application.routes.draw do
get 'welcome/index'
root 'welcome#index'
# For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end

Add below lines in /assets/stylesheets/application.css
/*
* This is a manifest file that'll be compiled into application.css, which will include all the files
* listed below.
*
* Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
* or any plugin's vendor/assets/stylesheets directory can be referenced here using a relative path.
*
* You're free to add application-wide styles to this file and they'll appear at the bottom of the
* compiled file so the styles you add here take precedence over styles defined in any styles
* defined in the other CSS/SCSS files in this directory. It is generally better to create a new
* file per style scope.
*
*= require_tree .
*= require_self
*/

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<%= stylesheet_link_tag "application", :media => "all" %>
If you've placed some styles in your 'application.css, just create a newcss.scssfile in yourapp/assets/stylesheets` and place them there .
It's because your scss file is having a compile time error. I am quite sure that if you replace it's contents with known valid ones, it will get compiled.
You may comment it and check if it compiles.
Always use 'application.CSS' as base CSS.
Others should be separate.

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