Can you post your code or try the following code?
<%@ Register TagPrefix="CE" Namespace="CuteEditor" Assembly="CuteEditor" %>
<%@ Page language="c#"%>
<html>
<head>
</head>
<body>
<form id="Form1" method="post" runat="server">
<CE:EDITOR id="Editor1" Autoconfigure="Simple" runat="server"></CE:EDITOR>
</form>
</body>
</html>
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