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

django.core.management.base.SystemCheckError: SystemCheckError: System check identified some issues:

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

System check identified 1 issue (0 silenced)

原因：redis配置必须要配置default：

CACHES = {
    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://127.0.0.1:6379",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",
        }
    },
    "verify_codes": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://127.0.0.1:6379/1",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",
        }
    },
}