The local IIS URL http://localhost/ specified for Web project
and then when you clicked yes, getting the following error:
Creation of the virtual directory http://localhost/ failed with the error: The URL 'http://localhost/' is already mapped to a different folder location.
All you need to do is to right click on the project file(with .csproj extension) and open the file in a text editor and update the
Check the following link for more info: