No route matches [GET] "/users/country.html" - ruby-on-rails

Question

It is nice when I directly open 'http://localhost:3000/country.html' or click 'Country' button on navigation bar. But if I click 'Login'/'Signup'(http://localhost:3000/users/signin.html) first and then click 'Country' button, the url link to 'http://localhost:3000/users/country.html'. It shows 'No Route matches [GET] "/users/maison.html"'. Even more, the colour of 'Login' changes to a strange red which is similar to the default red '404' page in public.
Could anybody tell me why different clicking sequences will lead to different urls and how can I figure out the issue? Thanks!
This is an app based on Ruby on Rail, with devise, ruby-2.3.7,'rails', '~> 5.2.2' and mysql. I am using macOS Mojave.
'''
'application.html.erb':
<div class="outside_container">
<div class="main_container">
<div class="navbar clearfix">
<div class="container">
<ul class="nav left">
<li>Introduction</li>
<li>Country</li>
<li>Maison</li>
</ul>
<% if notice %>
<p class="notification"><%= notice %></p>
<% end %>
<% if alert %>
<p class="notification"><%= alert %></p>
<% end %>
<ul>
<p class="nav right">
<% if user_signed_in? %>
<%= link_to "Edit profile", edit_user_registration_path %> |
<%= link_to "Logout", destroy_user_session_path, method: :delete %> |
<% else %>
<%= link_to "Sign up", new_user_registration_path %> |
<%= link_to "Login", new_user_session_path %> |
<% end %>
</p>
</ul>
</div>
</div>
'''
sorry for missing route.rb, here it is:
'route.rb':
Rails.application.routes.draw do
devise_for :users
#make sure devise/session/new, which means the login page is the root page
devise_scope :user do
authenticated :user do
root 'country#index', as: :authenticated_root
end
unauthenticated do
root 'devise/sessions#new', as: :unauthenticated_root
end
end
get '/country', to: 'country#index'
get '/maison', to: 'maison#index'
# The priority is based upon order of creation: first created -> highest priority.
# See how all your routes lay out with "rake routes".
# You can have the root of your site routed with "root"
#root 'page#welcome'
resources :country
resources :maison
resources :introduction
resources :dashboard
end

Answer 1

So it looks like you have an href <li>Maison</li> that is pointing to /maison which means somewhere in your routes.rb there needs to be a route defined that matches that, as well as a controller that the route interfaces with:
get '/maison', to: 'home#index`
In the above route, we're saying "any get request to the /maison address should trigger the index method in the home_controller file in Rails.
Once you set the route and controller correctly, this should work properly.

Answer 2

There are a couple things:
The file should be titled routes.rb (plural)
So change route.rb to routes.rb.
Use the command $rails routes or $rake routes
To get a list of all routes you currently have available to you. If nothing shows, then rails is not recognizing your routes.
Use "Link To" for example
<%= link_to user.title, users_path(user) %>

Answer 3

Remove the dot from your URLs. The dot makes it a relative path, so wherever you are in your app, it will use that path as the starting point for those links. If you remove the period, it will always use your root path to build the links.
<li>Introduction</li>
<li>Country</li>
<li>Maison</li>