iamjamesduncan,
It looks like you are using a convertion tool which caused the problem.
Please open the imageeditor.aspx.
And make sure the top three line code are:
<%@ Page Language="C#" Inherits="CuteEditor.EditorUtilityPage" %>
<%@import Namespace="System.IO"%>
<%@ Register TagPrefix="CE" namespace="CuteEditor.ImageEditor" assembly = "CuteEditor.ImageEditor" %>
asp.net Chat http://cutesoft.net/ASP.NET+Chat/default.aspx
Web Messenger: http://cutesoft.net/Web-Messenger/default.aspx
asp.net wysiwyg editor: http://cutesoft.net/ASP.NET+WYSIWYG+Editor/default.aspx
asp wysiwyg html editor: http://cutesoft.net/ASP
asp.net Image Gallery: http://cutesoft.net/ASP.NET+Image+Gallery/default.aspx
Live Support: http://cutesoft.net/live-support/default.aspx