I have version 5.0 and am getting this same error.
On my local development machine I have a virtual directory in IIS mapped to a network share.
I receive the "Setting not Fould!" error whenever I click on either of the insert image buttons or the downloadable files button. My code for setting the ImageGalleryPath is as follows:
Editor.BaseHref = "http://localhost/"
x = virtual_directory & folderName & "uploads/images"
Editor.SetSecurityImageGalleryPath(x)
I can confirm that the path using this virtual directory is correct by successfully opening an image like this:
http://localhost/
virtual_directory/
folderName/uploads/images/test.gif
Any ideas why I would be getting this "Setting not Fould!" error message?
Thanks.