[Rails] Error while using a Named Route for navigation

I have home.html.erb file which has a link for course.html.erb file using link_to. I have defined a named route for this navigation. On clicking the link, I get an error as shown below. Looks like the named route is not accessible in the view.

Is my routes.rb entry correct? I am not sure if after match in routes.rb file, the name of view should be in single quotes or double quotes and whether a "/" is needed before view name. I tried both, it didn't work. 

Error:

undefined local variable or method `training_path' for #<#<Class:0xa856f9c>:0xa857244>

----

views/trainer/home.html.erb

<li>   <%= link_to "Training", training_path %>  </li>

routes.rb

resources :trainer do      match "/course", to: 'trainer#course', :as => :training   end

controller/trainer_controller.rb

class TrainerController < ApplicationController
  

def course   end

end

views/trainer/course.html.erb

<h1> Learning Ruby </h1>

rake routes shows me following line related to the route: 

trainer_training        /trainer/:trainer_id/course(.:format)       trainer#course

Thanks. 

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