No route matches [POST] "/prototypes/8"　エラー文の解決

No route matches [POST] "/prototypes/8"

<%if user_signed_in? %>
          <%= form_with(model:@comment, local: true) do |f|%>
            <div class="field">
              <%= f.label :text, "コメント" %><br />
              <%= f.text_field :text %>
            </div>
            <div class="actions">
              <%= f.submit "送信する", class: :form__btn  %>
            </div>
          <% end %> 
        <% else %>
        <ul class="comments_lists">
          <%# 投稿に紐づくコメントを一覧する処理を記述する %>
            <li class="comments_list">
              <%# <%= " コメントのテキスト "%>
              <%# <%= link_to "（ ユーザー名 ）", root_path, class: :comment_user %>
            </li>
          <%# // 投稿に紐づくコメントを一覧する処理を記述する %>
        </ul>
        <% end %>

class CommentsController < ApplicationController
  def create
    @comment = Comment.new(comment_params)
    if @comment.save
      redirect_to prototype_path(@comment.prototype)
    else
      @prototype = @comment.prototype
      @comments = @prototypes.comments
      render "prototypes/show" 
    end
  end



  private
  def comment_params
    params.require(:comment).permit(:text).merge(user_id: current_user.id, prototype_id: params[:prototype_id])
  end
end

Rails.application.routes.draw do
  devise_for :users
  root to: "prototypes#index"
  resources :prototypes do
     resources :comments, only: :create
  end
end

class PrototypesController < ApplicationController
  def index
    @prototypes=Prototype.all.includes(:user)
  end

  def new
    @prototype=Prototype.new
  end

  def create
    @prototype=Prototype.new(prototype_params)
    if @prototype.save
       redirect_to root_path
    else
       render :new
    end
  end

  def show
    @prototype = Prototype.find(params[:id])
    @comment=Comment.new
  end

  def edit
    @prototype = Prototype.find(params[:id])
  end

  def update
    @prototype = Prototype.find(params[:id])
    if @prototype.update(prototype_params)
       redirect_to prototype_path
    else
       render :edit
    end
  end

  def destroy
    prototype = Prototype.find(params[:id])
    prototype.destroy
    redirect_to root_path
  end


  private

  def prototype_params
    params.require(:prototype).permit(:title,:catch_copy,:concept,:image).merge(user_id: current_user.id)
  end
end