rails won't render error messages for failed validations

I can't get rails to render any error messages. I have this code at the top of a form partial for a simple crud project.

 <% if @article.errors.any? %>
        
        <h2><%= pluralize(@article.errors.count, "error") %> prohibited this article from being saved:</h2>
        <ul>
            <% @article.errors.each do |error| %>
                <li><%= error.full_message %></li>
            <% end %>
        </ul>
        
    <% end %>

and these are the validations inside of the model

class Article < ApplicationRecord
    validates :title, presence: true, length: {minimum: 5, maximum:100}
    validates :body, presence: true, length: {minimum: 10, maximum: 300}
end

when I try to save a new article in the web browser with the incorrect title and body length nothing happens. when I try to save an article manually in the console it fails and the errors are displayed when I enter article.errors.full_messages.I don't know why the errors won't display in the browser. Any advice is appreciated

edited- added controller and routes code

articles_controller.rb

class ArticlesController < ApplicationController
    before_action :set_article, only: [:show,:edit,:update,:destroy]
    
    def show
        
    end

    def index
        @articles = Article.all 
    end

    def new 
        @article = Article.new
    end

    def edit
        
    end 

    def create 
       @article = Article.new(article_params)
       if @article.save
        flash[:notice] = "Article was created successfully!"
        redirect_to @article 

       else 
        render 'new'
       end
    end

    def update
        
        if @article.update(article_params)
            flash[:notice] = "Article was updated successfully!"
            redirect_to @article
        else
            render 'edit'
        end
    end

    def destroy 
        
        @article.destroy
        flash[:alert] = "Article was deleted successfully!"
        redirect_to articles_path
    end

    private

    def set_article
        @article = Article.find(params[:id])
    end

    def article_params 
        params.require(:article).permit(:title, :body)
    end

    def check_input

        
    end

    

        


end 

routes.rb

Rails.application.routes.draw do
  # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html

  # Defines the root path route ("/")
  
  root "pages#home"

  resources :articles
  
end