Ticket #1142 (new defect)

Description

sometimes prepare-sip throws an error that seems to have nothing to do with an actual problem.

it tends to happen on larger article packages

Warning: validation was turned on but an org.xml.sax.ErrorHandler was not
set, which is probably not what is desired.  Parser will use a default
ErrorHandler to print the first 10 errors.  Please call
the 'setErrorHandler' method to fix this.
Error: URI=null Line=163: The content of element type "object" must match "(representation)+".

when these packages are ingested, there's no problem.

these errors are reproduceable, but we can't figure out what (if anything) in the XML is causing them.

i'll upload an example article.