Hi sansindia85,
Do you get the same issue by the example page below(also use UploaderDebug=1)?
<%@ Page Language="C#" %>
<%@ Register Namespace="CuteWebUI" Assembly="CuteWebUI.AjaxUploader" TagPrefix="CuteWebUI" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>example</title>
</head>
<body>
<form id="form1" runat="server">
<CuteWebUI:UploadAttachments ID="uploader1" runat="server">
</CuteWebUI:UploadAttachments>
</form>
</body>
</html>
Regards,
Ken