Issue with displaying news short description

Faced the problem of displaying a short description of the news.

I set up the creation of posts and everything works fine. But I cannot show the short description on the blog page

I am using a loop to output the description

{% set postslist = %}

    {% for post in postslist %}
  • {{ }} - {{ | readableDate }} - {{ }}
  • {% endfor %} – refers to json tags “post” as shown in the examples

But when I run the project, I get the error - tag set not found …

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