help

Hi,

I have obtain this error:
Unable to locate the reference to a supported schema type(DTD, W3W Schema) within this document instance.

<ProcessSpecification xmlns="http://docs.oasis-open.org/ebxml-bp/ebbp-2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="ebMail Sample Format Order With Simple Response" nameID="ebMailSampleFormatOrderWithSimpleResponse_PS"  specificationVersion="2" instanceVersion="1.0.0" uuid="www-systml-co-uk-xml-profiles-ubl-2-order-with-simple-response">

What´s happened? thanks very much