Rails５】ActionController::ParameterMissingが表示される

[エラー内容]
paramsが空だと言ってますがbinding.pryで確認したところ

 14: def create
    15: 	  	binding.pry
 => 16: 	item = Item.find(params[:item_id])
    17: 	cart_item = current_end_user.cart_items.new(cart_item_params)
    18: 	cart_item.item_id = item.id
    19: 	if cart_item.save
    20: 	   redirect_to cart_items_path
    21: 	else render 'public/items/show'
    22: 	end
    23: end

[1] pry(#<Public::CartItemsController>)> params
=> <ActionController::Parameters {"utf8"=>"✓", "authenticity_token"=>"oLYZB8MASqO0G7DzX4zNXj8sDCGKAtdjrPkhmK8uk5q9TCvXC1/r2YAkZMjCxmylXJ0J3CbuQg9u/nZHQD9dhg==", "quantity"=>"1", "commit"=>"カートに入れる", "controller"=>"public/cart_items", "action"=>"create", "item_id"=>"1"} permitted: false>

このようにparamsでデータは取得できている状態です。なのでなぜエラーになるのかがわかりません。

controllers/public::cart_items_controller

class Public::CartItemsController < ApplicationController
  def index
  end

  def update
  end

  def destroy
  end

  def destroy_all
  end

  def create
  	item = Item.find(params[:item_id])
  	cart_item = current_end_user.cart_items.new(cart_item_params)
  	binding.pry
  	cart_item.item_id = item.id
  	if cart_item.save
  	   redirect_to cart_items_path
  	else render 'public/items/show'
  	end
  end
-エラー箇所-
  private
  def cart_item_params
  	params.require(:cart_item).permit(:quantity)
  end
  	
end

controllers/public::items_controller

class Public::ItemsController < ApplicationController
  def top
  end

  def index
  	 @items = Item.all
  end

  def show
  	@item = Item.find(params[:id])
  	@cart_item = CartItem.new
  end
end

show.html.erb-items

<div class="row">
	<div class="col-xs-2"></div>
	<div class="col-xs-10">
		<div class="col-xs-5">
			<%= attachment_image_tag @item,:image,format:'jpeg',fallback:'no_image.jpg',size:'150x150'%>
		</div>
		<div class="col-xs-7">
			<h3><%= @item.name %></h3>
			<p><%= @item.detail %></p>
			<h3>¥<%= "#{@item.price * 1.10}".to_i %>
				<p style="display: inline-block; font-size: 15px">(税込)</p>
			</h3>
			<%= form_with model:@cart_item,url:item_cart_items_path(@item.id),id:'cart_items',class: 'cart_items',local: true do |f| %>
				<%= f.select :quantity,[["1",1],["2",2],["3",3],["4",4],["5",5],["6",6],["7",7],["8",8],["9",9],["10",10]],include_blank: "個数選択" %>
				<%= f.submit "カートに入れる",class:'btn btn-primary' %>
			<% end %>
		</div>
	</div>
</div>

routes.rb

scope module: :public do
  	resources :items,only: [:index,:show]
    resource :end_users,only: [:show,:edit,:update]
    get 'end_users/leave' => 'end_users#leave'
    patch 'end_users/withdrawal' => 'end_users#withdrawal'
    resources :items,only: [] do
    	resources :cart_items,only: [:create]
	end
	resources :cart_items,only: [:index,:update,:destroy]
    delete 'cart_items' => 'cart_items#destroy_all'
  end

よろしくお願いします。