I was recently trying to figure out how to add settings to the Basic Settings section in a multisite instance. I happened upon this post and followed the provided example exactly, adding the files to my project and altering my Global.ascx file accordingly. However, when trying to visit the settings page (this happens on basic settings, not advanced settings), I get this error:
"An item with the same key has already been added."
I've tried changing the property, changing the view, and changing the file names, but all to no avail.
Can anyone give me some insight as to why I may be getting this error? Thanks