[Django]-OSError: No translation files found for default language zh_Hans

You should use:

LANGUAGE_CODE = ‘zh-hans’

Also when you use django-admin makemessages -l zh_hans

Note: one is zh-hans, one is zh_hans.

I got the same error below:

OSError: No translation files found for default language hello.

When I set hello to LANGUAGE_CODE and LANGUAGES in settings.py as shown below. *I’m learning Translation with Django 4.2.1:

# "settings.py"

LANGUAGE_CODE = 'hello'

from django.utils.translation import gettext_lazy as _

LANGUAGES = (
    ('hello', _('Hello')),
)

So, I ran makemessages below but I couldn’t solve the error:

django-admin makemessages -l hello

So, I ran compilemessages below, then I could solve the error:

django-admin compilemessages

But, I got another error below and I could not solve the error with several solutions:

ValueError: invalid token in plural form: EXPRESSION

Finally, I found the answer below saying:

You should use LANGUAGE_CODE exactly as mentioned in LANGUAGES list
located in django/conf/global_settings.py

So, I should set the languages listed in LANGUAGES in django/conf/global_settings.py to LANGUAGE_CODE and LANGUAGES in settings.py.