Django unresolved tag "load" at DRF api.html

I have the following fully-functioning project/rest_framework/api.html:

{% extends 'rest_framework/base.html' %}

{% load static %}

{% block style %}
    {{ block.super }}
    <link rel="stylesheet" href="{% static 'css/General.css' %}">
{% endblock %}

the problem is, that load is underlined, commented "unresolved tag 'load'. As well no style changes apear on web page even after restarting the server and shift-f5 reload.

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