select2 caches error

hi all I’m trying using select2 but when i run makemigrations or migrate command error appears:

ERRORS:
?: (caches.E001) You must define a 'default' cache in your CACHES setting.

the actual caches is

CACHES = {
    # … default cache config and others
    "select2": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://127.0.0.1:6379/2",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",
        }
    }
}

# Tell select2 which cache configuration to use:
SELECT2_CACHE_BACKEND = "select2"

What do you think this error message is telling you?

With that, then what do you think the comment in the beginning of your CACHES definition means?

Also see the docs for