WebForms UnobtrusiveValidationMode requires a ScriptResource mapping for 'jquery'

I was recently working with an ASP.NET Web Forms application and encountered the following error message:

Well, as it turns out, I had to add the following element to my appSettings element:

<add key="ValidationSettings:UnobtrusiveValidationMode" value="None" /> 

That was all that was needed to resolve this error message!