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Question : While working on an AJAX-enabled application, I got "Object reference not set to an instance of an object when using HTMLEditorExtender". How do I fix this? Answer : Add a register page directive referencing the AjaxControlToolKit. This is in addition to the steps mentioned at http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/HTMLEditorExtender/HTMLEditorExtender.aspx