cannot load Twig template (Symfony 2.8.8) - symfony

Question

So I have the folder structure below:
According to the Symfony manual (click here), I should be able to load my Twig template but Symfony cannot find it.
Any ideas what I could be doing wrong? Thank you.
codes I've tried
return $this->render(
"AppBundle:DisplayForm.html.twig"
, array(
"form" => $form->createView()
);
return $this->render(
"DisplayForm.html.twig"
, array(
"form" => $form->createView()
)
);
Contents of my app/AppKernel.php
<?php
use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\Config\Loader\LoaderInterface;
class AppKernel extends Kernel
{
public function registerBundles()
{
$bundles = array(
new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
new Symfony\Bundle\SecurityBundle\SecurityBundle(),
new Symfony\Bundle\TwigBundle\TwigBundle(),
new Symfony\Bundle\MonologBundle\MonologBundle(),
new Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle(),
new Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),
new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),
new AppBundle\AppBundle(),
new Symfony\Bundle\AsseticBundle\AsseticBundle(),
);
if (in_array($this->getEnvironment(), array('dev', 'test'), true)) {
$bundles[] = new Symfony\Bundle\DebugBundle\DebugBundle();
$bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
$bundles[] = new Sensio\Bundle\DistributionBundle\SensioDistributionBundle();
$bundles[] = new Sensio\Bundle\GeneratorBundle\SensioGeneratorBundle();
}
return $bundles;
}
public function registerContainerConfiguration(LoaderInterface $loader)
{
$loader->load($this->getRootDir().'/config/config_'.$this->getEnvironment().'.yml');
}
}
contents of app/config/config.yml
imports:
- { resource: parameters.yml }
- { resource: security.yml }
- { resource: services.yml }
# Put parameters here that don't need to change on each machine where the app is deployed
# http://symfony.com/doc/current/best_practices/configuration.html#application-related-configuration
parameters:
locale: en
framework:
#esi: ~
#translator: { fallbacks: ["%locale%"] }
secret: "%secret%"
router:
resource: "%kernel.root_dir%/config/routing.yml"
strict_requirements: ~
form: ~
csrf_protection: ~
validation: { enable_annotations: true }
#serializer: { enable_annotations: true }
templating:
engines: ['twig']
default_locale: "%locale%"
trusted_hosts: ~
trusted_proxies: ~
session:
# handler_id set to null will use default session handler from php.ini
handler_id: ~
fragments: ~
http_method_override: true
# Twig Configuration
twig:
debug: "%kernel.debug%"
strict_variables: "%kernel.debug%"
# Doctrine Configuration
doctrine:
dbal:
driver: "%database_driver%"
host: "%database_host%"
port: "%database_port%"
dbname: "%database_name%"
user: "%database_user%"
password: "%database_password%"
charset: UTF8
# if using pdo_sqlite as your database driver:
# 1. add the path in parameters.yml
# e.g. database_path: "%kernel.root_dir%/data/data.db3"
# 2. Uncomment database_path in parameters.yml.dist
# 3. Uncomment next line:
# path: "%database_path%"
orm:
auto_generate_proxy_classes: "%kernel.debug%"
naming_strategy: doctrine.orm.naming_strategy.underscore
auto_mapping: true
# Swiftmailer Configuration
swiftmailer:
transport: "%mailer_transport%"
host: "%mailer_host%"
username: "%mailer_user%"
password: "%mailer_password%"
spool: { type: memory }
assetic:
debug: '%kernel.debug%'
use_controller: '%kernel.debug%'
filters:
cssrewrite: ~

Answer 1

Because you are storing the template inside the bundle, you also have to reference the directory within the views - in this case, a 'null' directory.
AppBundle::DisplayForm.html.twig
Note the :: for the directory.
If you moved the entire AppBundle/Resources/views/ directory to app/Resources/views/ then you would be able to reference them much as a plain subdirectory:
Referencing templates stored in:
app/Resources/views/ | AcmeDemoBundle/Resources/views
----------------------------- | -------------------------------
index.html.twig | AcmeDemoBundle::index.html.twig
Default/subdir/index.html.twig | AcmeDemoBundle:Default:subdir/index.html.twig
Default/subdir/index.html.twig | AcmeDemoBundle:Default/subdir:index.html.twig

Answer 2

Probably you have forgotten an # symbol:
return $this->render(
"#AppBundle/DisplayForm.html.twig", [
"form" => $form->createView(
]
);