LibreOffice Base reports not working after update to Kubuntu 15.10

I use LibreOffice Base 4.x with the report builder on Kubuntu 15.04. All my reports word fine. After an update to Kubuntu 15.10 with LO 5.0.2.2 last week, I get the following Error message:

Eine Ausnahme vom Typ com.sun.star.lang.WrappedTargetException wurde entdeckt.

org.libreoffice.report.ReportExecutionException: Namespace is not defined.
org.libreoffice.report.ReportExecutionException: Namespace is not defined.
org.libreoffice.report.pentaho.PentahoReportJob.execute(PentahoReportJob.jav:353) at org.libreoffice.report.pentaho.SOReportJobFactory$_SOReportJobFactory.execute(SOReportJobFactory.java:217)
Caused by: java.lang.IllegalArgumentException: Namespace is not defined.
org.pentaho.reporting.libraries.xmlns.writer.XmlWriterSupport.writeTag(XmlWriterSupport.java:642)
org.pentaho.reporting.libraries.xmlns.writer.XmlWriter.writeTag(XmlWriter.java:214)
at org.libreoffice.report.pentaho.output.text.TextRawReportTarget.startOther(TextRawReportTarget.java:693)
at org.libreoffice.report.pentaho.output.OfficeDocumentReportTarget.startElement(OfficeDocumentReportTarget.java:706)
at org.jfree.report.flow.layoutprocessor.ElementLayoutController.startElement(Unknown Source)
at org.jfree.report.flow.layoutprocessor.ElementLayoutController.advance(Unknown Source)
at org.jfree.report.flow.AbstractReportProcessor.processReportRun(Unknown Source)
at org.jfree.report.flow.SinglePassReportProcessor.processReport(Unknown Source)
at org.libreoffice.report.pentaho.PentahoReportJob.execute(PentahoReportJob.java:341)
… 1 more

Any Ideas how I can solve it?