it worked!!....
<insertparameters>
<%--<asp:parameter name="EMP_ID" type="Decimal" xmlns:asp="#unknown" />--%>
<asp:parameter name="FNAME" type="String" xmlns:asp="#unknown" />
<asp:parameter name="GENDER" type="String" xmlns:asp="#unknown" />
<asp:parameter name="DEPT" type="String" xmlns:asp="#unknown" />
</insertparameters>
I commented the EMP_ID parameter that was uncommented before... :)