LPX-00320

Error: LPX-00320: No more attributes can be added to a non-empty element

Causa: The element to which an attribute was being added is non-empty and hence can not add anymore attributes to it.

Acción: Modify the XSLT stylesheet so that all the attributes are added to an element before anything else is added to it. If you absolutely can not do that then select your output method to be DOM based rather then a stream or SAX based output which you are using presently.