How to solve TemplateSyntaxError at /ads/?

Question

Django

Hello! Faced an error:

TemplateSyntaxError at /ads/
'app_tags' is not a registered tag library. Must be one of:
admin_list
admin_modify
admin_urls
cache
crispy_forms_field
crispy_forms_filters
crispy_forms_tags
crispy_forms_utils
debugger_tags
highlighting
humanize
i18n
indent_text
l10n
log
rest_framework
static
syntax_color
truncate_letters
tz
widont

Can't decide at all. Help me please.
More details can be found at the link.
Thanks in advance!