template/bad-var

A Template extends a Layout without setting a variable its vars comment requires, or sets one to a value of the wrong type.

Example

{% extends "layouts/base.html" %}
{% block content %}…{% endblock %}
(with `{# vars: title: string #}` in the Layout)

Fix

Set the variable before the first block, {% set title = "Tags" %}, with a value of the type the vars comment gives it.