grammer with uri not found

I am using xerces parser version 1.4.1

I am facing problems when I try to validate the xml based on the schema.
When do you get this error

I get the following error Grammar with uri 2: http://www.ifxforum.org can not found.

My xml header is 

<?xml version="1.0" encoding="UTF-8"?><xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance" xmlns="http://www.ifxforum.org"  xsi:schemaLocation="http://www.ifxforum.org  file:///SchemaRedefine/2001_IFX110.xsd">

My schema header is 

<?xml version="1.0" encoding="UTF-8"?>
-->
<xsd:schema
    targetNamespace="http://www.ifxforum.org"
    xmlns:xsd="http://www.w3.org/2000/10/XMLSchema"
    xmlns:ifx="http://www.ifxforum.org">




thanks,

Deepak