Thread:Project:Support desk/DoPOST when selecting Add User from Special:UserAdmin - No Special Page when attempting to add user from "Add User" special page/reply (8)

I'm not sure, what the extension do there, but the link is false. The first seperator for page parameters must be a ? and all others a & not all a & or all a ?. If i'm right, the extension uses the URL or the adress bar as action for the form, so a very ugly workaround can be to call "index.php?title=Special:AddUser" in adress bar, instead of "Special:AddUser" (and change the ? back to &). Better is to set a fixed form submission target (or check if now & or ? comes).