创建app

错误

raise ImproperlyConfigured(
django.core.exceptions.ImproperlyConfigured: Cannot import 'rules'. Check that 'dvadmin.rules.apps.RulesConfig.name' is correct.

原因

刚创建的rules的app被手动移动到了dvadmin目录下
而dvadmin/rules/apps.py的内容还是：

解决

把这个name = 'rules'改为 name = 'dvadmin.rules'