unknown server tag 'act:HtmlEditorExtender'

The Visual Studio 2012 error message of the title can be resolved by entering the following in the CoT ( Web Server Configuration's modification instruction textbox:

[Please note that the less than and greater than symbols were replaced by | for the following text to display on the page properly...]

AppendChild: /configuration/system.web/pages/controls

|add tagPrefix="act" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit"/|
|add tagPrefix="act" namespace="AjaxControlToolkit.HTMLEditor" assembly="AjaxControlToolkit"/|
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