Django: Invalid block tag on line 5: 'static', expected 'endblock'. Did you forget to register or load this tag?

錯誤釋義：在第5行中無效的塊標簽:'static'，期望的'endblock'。你忘記登記或裝載這個標簽了嗎?

錯誤原因：沒有引入static文件

{% extends 'base.html' %}
{% load static %}

{% block ext_css %}
    {{block.super}}
    <link rel="stylesheet" href="{% static 'axf/main/css/main.css' %}">
{% endblock %}