Closed Issue: Sanitizer AntiXssSanitizerProvider Error in Web.Config [27262]

I'm adding the AntiXssSanitizerProvider sanitizer to my web.config file and I'm getting this error.

Unrecognized element 'sanitizer'
Comments: In the current v15.1 release of Ajax Control Toolkit, we moved a sanitizer to a separate NuGet package - "AjaxControlToolkit.HtmlEditor.Sanitizer". It also updates Web.config automatically, so this error no longer exists.