Rails High_Voltage error: undefined method 'page_path' for #<#<Class:.....>

Question

I used to link to static pages with a dedicated controller / view for each of them but, of course, this is odd.
I just installed the High_Voltage gem in my Rails (Rails 5.1.7 on Debian) app in order to create simpler, easily readable links.
I successfully routed:
page GET /pages/*id high_voltage/pages#show
and in my application.html.erb I included:
<% link_to "About", page_path(:id =>"about") %>
.../app/views/pages/about.html.erb exists - but I don't even get there, because Rails replies with a

NoMethodError in Welcome#index: undefined method 'page_path' for "#<#<Class:.....>

What's my new-bee mistake? Any hint is highly appreciated. Thanks!!
Karsten

Answer 1

I found out: after installation, I need to restart the puma server. That's it!