I want to override the error templates in Symfony 3. I've started by creating a TwigBundle folder withe the personalised twig.
app/
└─ Resources/
└─ TwigBundle/
└─ Exception/
├─ error404.html.twig
├─ error403.html.twig
├─ error.html.twig
Then I checked the routing_dev file which contains this lines :
_errors:
resource: "@TwigBundle/Resources/config/routing/errors.xml"
prefix: /_error
Symfony still displays the default error templates. I want to know if I should verify something else.
PS : I have already checked this documentation : How to Customize Error Pages
EDIT :

devenvironment. If you want to test the templates you need to access/_error/<error-code>.html(i.e.localhost:8000/_error/404.htmlwith the integrated webserver) - Nicolai Fröhlich