'Symfony Error: "An exception has been thrown during the rendering of a template"

I am trying to include

<link href="{{ asset('css/mystyle.css') }}"
      rel="stylesheet"/> 

in my twig file and render it. But it gives me Uncaught PHP Exception Twig_Error_Runtime:

"An exception has been thrown during the rendering of a template ("Asset manifest file "/../public/build/manifest.json" does not exist.")

It does work when i use

link href="css/mystyle.css"
          rel="stylesheet"/>

. Following is my controller:

    <?php

namespace App\Controller;

use Symfony\Component\Routing\Annotation\Route;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;

class WelcomeController extends AbstractController
{
    /**
     * @Route("/", name="welcome")
     */
    public function index()
    {
        return $this->render('welcome/index.html.twig');
    }
}

Following is my twig template:

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <meta name="description" content="">
    <meta name="author" content="">

    <title>Let's Explore Symfony 4</title>

    <!-- Bootstrap core CSS -->
    <link rel="stylesheet"
          href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.3/css/bootstrap.min.css"
          integrity="sha384-Zug+QiDoJOrZ5t4lssLdxGhVrurbmBWopoEl+M6BdEfwnCJZtKxi1KgxUyJq13dy"
          crossorigin="anonymous">

    <link href="{{ asset('css/mystyle.css') }}"
          rel="stylesheet"/>

</head>

<body>
<header>
    <nav class="navbar navbar-expand-sm navbar-dark bg-dark">
        <div class="container">

            <a class="navbar-brand" href="#">Home</a>

            <div class="collapse navbar-collapse">
                <ul class="navbar-nav mr-auto">
                    <li class="nav-item">
                        <a class="nav-link" href="#">Hello Page</a>
                    </li>
                </ul>
            </div>
        </div>

    </nav>
</header>

<main role="main" class="container main">
    <div>
        <h1>Let's Explore Symfony 4</h1>
        <p class="lead">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras rutrum sapien mauris, venenatis
            facilisis neque tincidunt vel. Maecenas vel felis vel turpis scelerisque eleifend. Fusce nec purus egestas,
            efficitur nisi ac, ultrices nulla. Pellentesque eu mollis tortor, in mollis nisl. Maecenas rhoncus quam non
            lacinia mollis.</p>
    </div>
</main>
</body>
</html>

How can i resolve this issue?



Solution 1:[1]

Execute the below commands:

yarn add --dev @symfony/webpack-encore

yarn add webpack-notifier --dev

yarn encore dev

It will generate the manifest.json file

Solution 2:[2]

I have resolved this problem by not using json_manifest_path: ~

comment out the json_manifest_path by adding '#' in front of it and add '~' after 'assets:'

framework:
    assets: ~
        #json_manifest_path: '%kernel.project_dir%/public/build/manifest.json'

Solution 3:[3]

yarn encore dev-server --hot creates the manifest.json file

Solution 4:[4]

manifest.json is new in Symfony 3.3.

So, you should have this lines in your config file :

# app/config/config.yml
framework:
    # ...
    assets:
        json_manifest_path: '%kernel.root_dir%/../web/build/manifest.json'

If manifest.json isn't exists, you should create it, like this :

{ "css/app.css": "build/css/mystyle.b916426ea1d10021f3f17ce8031f93c2.css", "...": "..." }

Solution 5:[5]

I have resolved this problem by not using json_manifest_path: ~

comment out the json_manifest_path by adding # in front of it and add ~ after assets:

framework:
    assets: ~
        #json_manifest_path: '%kernel.project_dir%/public/build/manifest.json'

Solution 6:[6]

Execute this command:

composer remove webpack

Solution 7:[7]

Hello I had the same probleme and I've found this as a solution, you only have tu run this "composer require symfony/webpack-encore-bundle". If it does not work try to run "npm build run" or "npm run watch", but before run it make sure that Node.js is installed as well as npm.

good luck

Solution 8:[8]

Remember that the question is tagged Symfony4!

I have the same issue to add logo in navbar, favicon…

In Symfony4, there are no more app directory, so no app/config/config.yml ! In Symfony4, web directory doesn't exist anymore but there are new directory public

As @Bijaya wrote, just specify href or src address in public

In my case, I have my logo: myProjectName/public/logo_mom.png

and in my controller, I have:

/**
 * @Route("/", name="home")
 */
public function home() {
    return $this->render('blog/home.html.twig', [
        'title' => "Bienvenue",
        'logo_path' => "logo_mom.png",
        'logo_alt' => "logo alt description",
    ]);
}

and in my home.html.twig:

{% block body %}
    <h1>{{ title }}</h1>
    <img src={{ logo_path }} alt={{ logo_alt}}>

and in my template/base.html.twig:

<link rel="icon" type="image/x-icon" href="favicon.ico" />

So for me who discover Symfony4 without previous Symfony version knowledge, it is nice that doesn't required asset function or any other configuration!

Solution 9:[9]

If removing json_manifest_path from framework.yaml did not help you, then just create a file in public/build/manifest.json. Put an empty json in the file: {}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Sangam Belose
Solution 2 Ham Dong Kyun
Solution 3 Sanne
Solution 4 Allan
Solution 5 nouvist
Solution 6 nougaoui nougaoui
Solution 7 HARAKAT Abdellah
Solution 8 bcag2
Solution 9 Harvey Dent