Silex + Twig. Why is it impossible to include a block in a template?

Question

PHP

Hi
For the first time I tried to take out part of the layout in a separate file and include it in the template.
I develop on silex using twig.
Everything seems simple in the twig documentation:

{% include 'header.html' %}
    Body
{% include 'footer.html' %}

http://twig.sensiolabs.org/doc/tags/include.html
After pasting like this I got the following error:
Twig_Error_Loader: Template "header.html" is not defined () in "article_add.twig" at line 26.
What do you recommend?

Answer 1

header.html, footer.html are in the same directory?

Answer 2

show all the code that works with twig.
apparently, you are working with twig something like this
$loader = new Twig_Loader_String();
$twig = new Twig_Environment($loader);
if the templates are in files, then you need
$loader = new Twig_Loader_Filesystem('/path/to/templates');
$twig = new Twig_Environment($loader);