我正在使用facebook oauth获取访问令牌。下面是我对app的设置：
under APPS DOMAIN :
www.testio.online
under Site URL:
https:// www.testio.online/
under Valid OAuth redirect URIs:
https://www.testio.online/fb/login/ , https://test.online/
但我仍然收到错误：
"Unable to Load URL: The domain of the URL is not included in this application domain. To be able to load this URL, add all domains and subdomains of your application to plot Domain Applications in your application settings."
"Code": 191,
为什么会出现这个错误？我该怎么调试呢？