Cannot save macros when Umbraco 7 in virtual directory

问题

I need to your help as I am new to Umbraco and deployment on IIS. I am deploying my Umbraco application under existing website like this:

But I am getting following error when save partial view macro in back office:

I don't want to create a new website instead add Umbraco as a new application under existing website.Please guide me!

来源：https://stackoverflow.com/questions/44590291/cannot-save-macros-when-umbraco-7-in-virtual-directory