Created Unassigned: Script Error in HtmlEditorExtender.AjaxFileUpload [27526]

AjaxControlToolKit Version = 4.1.7.607 (.NET4)

IDE : Visual Studio 2010 Pro,

Windows : Windows 7 Pro

Issues : All Browsers.

Description:

Single file uploading is fine.

If two or more are selected, always last file upload got script error as attachments.
(TypeError: Cannot call method 'removeChild' of undefined)

So, I download and run whole sample site of AJAXControlToolkit, still same issue.

But, original sample is working great. (Multiple file selection disabled on IE)
http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/HTMLEditorExtender/HTMLEditorExtender.aspx