[Django]-"TemplateSyntaxError: 'humanize' is not a valid tag library:" in DJango

As the docs say:

To activate these filters, add ‘django.contrib.humanize’ to your INSTALLED_APPS setting.

So perhaps you should have “django.” not “Django.” ? See Django docs on django.contrib.humanize

Also do you have “{% load humanize %}” in the templates?
You may also want to look at TemplateSyntaxError: ‘settings_tags’ is not a valid tag library