Rails invent me something

Hi, i’m french sorry for my english.

I have a little with Rails, he say me somethings is not related and i
have a bug.

This is my forum controller: class Admin::ForumsController < ApplicationController layout "admin" before_ - Pastebin.com
My _form.html.erb: <%= simple_form_for [:admin, @forum] do |f| %> <%= f.input :title %> <%= f - Pastebin.com
My routes: Rails.application.routes.draw do resources :categories, only: [:show, :index] - Pastebin.com

A screen of my rake routes:

And a screen of the error…

I don’t know where is found foras ? WHAT THE FUCK ?

Thanks you