Hi hassan,
CuteEditor inclue AjaxUploader, try use CE:Uploader(Uploader in CuteEditor) replace CuteWebUI:Uploader(AjaxUploader)
<%@ Register Assembly="CuteEditor" Namespace="CuteEditor" TagPrefix="CE" %>
<CE:Uploader ID="upload1" runat="server">
</CE:Uploader>
Regards,
ken