error in oxf:request

>
> I use oxf:request in my xpl but it doesn't work well.
>
>                <p:processor name="oxf:request">
>                    <p:input name="config">
>                        <config>
>                            <include>/request</include>
>                        </config>
>                    </p:input>
>                    <p:output name="data" id="request"/>
>                </p:processor>
> When I access it by URL (/myapp/gettestxpl) , it works well.
>
> When I access it in submission, it throws out an error. What's the
> difference between URL and submission? Did I use it in wrong way?
>
> submission:
>       <xforms:submission id="mysubmission"
>                           ref="instance('myrequest')"
>                           replace="instance"
>                           instance="myresponse"
>                           method="post"
>                           action="/myapp/gettestxpl">
>
>
> page flow:
> <page path-info="/phs/gettestxpl" view="test.xpl"/>
>
> error info:
> 2008-07-23 22:09:14,065 ERROR ProcessorService  - Exception at line  
> 17,
> column 57 of oxf:/apps/collections/collection.xpl (reading processor  
> output:
> name='data', id='request')
> org.dom4j.IllegalAddException: The node
> "org.orbeon.oxf.xml.dom4j.NonLazyUserDataElement@161e60b [Element:  
> <protocol
> attributes: []/>] userData: null" could not be added to the branch  
> "null"
> because: Cannot add another element to this Document as it already  
> has a
> root element of: request
> at
> org
> .dom4j
> .tree.AbstractDocument.checkAddElementAllowed(AbstractDocument.java:
> 241)
> at org.dom4j.tree.AbstractDocument.add(AbstractDocument.java:203)
> at org.dom4j.tree.AbstractDocument.addElement(AbstractDocument.java:
> 188)
> at  
> org.dom4j.io.SAXContentHandler.startElement(SAXContentHandler.java:
> 243)
>
>
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