"'tag' is not a registered tag library. Must be one of" in a Django app

Question

I added my simple tags to my file in template tags. My first tag is visible and it works properly, but the second one does not work. I receive information ''deposit_earn' is not a registered tag library. Must be one of:' after I added tags to my template {% load deposit_earn %}.

My tag file looks like this:

@register.simple_tag()
def multiply(number_instalment_loans, rrso, balance):
    rrso_percent = rrso/100
    return round(discounted_interest_rate(12, number_instalment_loans, rrso_percent, balance))

@register.simple_tag()
def deposit_earn(period, interest, balance):
    interest_percent = interest/100
    equals = balance * interest_percent * period / 12
    return round(equals)

Why is my first tag working and not the second one? I tried to reset the server after registering the tags, but it did not help.

Answer 1

https://docs.djangoproject.com/en/2.2/howto/custom-template-tags/

you should import templatetags file name, not method name

polls/
    __init__.py
    models.py
    templatetags/
        __init__.py
        poll_extras.py
    views.py

let say multiply and deposit_earn inside of poll_extras.py

then in your template, you just need call poll_extras

{% load poll_extras %}

{{ something|multiply }}
or
{{ something|deposit_earn }}