java.lang.NullPointerException

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<ows:ExceptionReport xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:ows="http://www.opengis.net/ows" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0.0" xsi:schemaLocation="http://www.opengis.net/ows http://bgtviewer.nl/geoserver/schemas/ows/1.0.0/owsExceptionReport.xsd">

<ows:Exception exceptionCode="NoApplicableCode">

<ows:ExceptionText>java.lang.NullPointerException</ows:ExceptionText>

...

</ows:Exception>

...

</ows:ExceptionReport>