ArgumentError: Missing :controller key on routes definition

Rails.application.routes.draw do

  resources :items

  root 'items#index'


  get 'items/index', to:'items/index'
  get 'items/show', to:'items/show'
  get 'items/new', to:'items/new'
  get 'items/edit', to:'items/edit'

  post '/items/create', to:'items/create'
  post '/items/update', to:'items/update'
  post '/items/destroy', to:'items/destroy'

  get '/users/userindex', to: 'users/userindex'
  get '/users/usershow', to: 'users/usershow'
  get '/users/usernew', to: 'users/usernew'

end