Server not configured to parse request

How do I fix it?

This is an internal Coupa error. If you see this error, please contact Coupa support.

Example

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE cXML SYSTEM "http://xml.cxml.org/schemas/cXML/1.2.020/cXML.dtd">
<cXML xml:lang="en-US" timestamp="2015-03-01T16:03:51+00:00" payloadID="20150301 160344.345">
  <Response>
    <Status text="Internal Server Error" code="500">Server not configured to parse request.</Status>
  </Response>
</cXML>