Addons store isn't working for me

[scripto]

When I'm trying to open addons store I'm getting 500 error, in debug mode I'm getting that error

Twig_Error_Runtime in layout.html.twig line 34:
An exception has been thrown during the rendering of a template ("PrestaShopBundle\Twig\LayoutExtension cannot find the {$content} string in legacy layout template").

1. in layout.html.twig line 34
2. and a lot of html code

What is the problem?