django.core.exceptions.ImproperlyConfigured: Requested setting INSTALLED_APPS, but settings are not

django.core.exceptions.ImproperlyConfigured: Requested setting INSTALLED_APPS, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

解决方案：
开发Django项目时使用PyCharm运行项目时总是报错，找了好久，猛然发现：
启动有误啊！！

应该是这样：


然后启动、哈哈哈、一切正常

大意惹的祸啊！！！