How to use "Creating Friendly URLs and Caching" in "member do" ?

[akkyta]

I want to use the contents described in the "Creating Friendly URLs and Caching" of the README.md in the "member do" of routes.
I've tested it a lot, but I get an error and can't use it.

I use Rails 5.2.5

My routes code is this.

resources :events do
　member do
　　get 'message' => 'events#message'
　end
end

my events contoroller's method "message" is this.

supporters =  Supporter.where(id: params[:id])
@message = Kaminari.paginate_array(supporters).page(params[:page]).per(##)

and I tried this code

resources :events, concerns: :paginatable do
　member do
      get '(message/:page)', action: :index, on: :collection, as: ''
    end
end

and

concern :paginatable do
  get '(message/:page)', action: :index, on: :collection, as: ''
end

resources :events do
　member do
　　get 'message' => 'events#message'
　end
end

I've done a lot of other tests, but all of them resulted in a routes error.

I am very confused about how to solve this problem.
I would appreciate it if you could help me.
Thank you