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java.lang.NullPointerException at com.databasepreservation.modules.siard.common.SIARDArchiveContainer.toString(SIARDArchiveContainer.java:27) at org.slf4j.helpers.MessageFormatter.safeObjectAppend(MessageFormatter.java:305) at org.slf4j.helpers.MessageFormatter.deeplyAppendParameter(MessageFormatter.java:277) at org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:231) at ch.qos.logback.classic.spi.LoggingEvent.getFormattedMessage(LoggingEvent.java:293) at ch.qos.logback.classic.spi.LoggingEvent.prepareForDeferredProcessing(LoggingEvent.java:206) at ch.qos.logback.core.OutputStreamAppender.subAppend(OutputStreamAppender.java:205) at ch.qos.logback.core.rolling.RollingFileAppender.subAppend(RollingFileAppender.java:228) at ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.java:100) at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:84) at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:48) at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:270) at ch.qos.logback.classic.Logger.callAppenders(Logger.java:257) at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:421) at ch.qos.logback.classic.Logger.filterAndLog_2(Logger.java:414) at ch.qos.logback.classic.Logger.debug(Logger.java:490) at com.databasepreservation.modules.siard.in.content.SIARD2ContentImportStrategy.startElement(SIARD2ContentImportStrategy.java:238) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.emptyElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at com.databasepreservation.modules.siard.in.content.SIARD2ContentImportStrategy.importContent(SIARD2ContentImportStrategy.java:142) at com.databasepreservation.modules.siard.in.input.SIARDImportDefault.getDatabase(SIARDImportDefault.java:45) at com.databasepreservation.Main.run(Main.java:127) at com.databasepreservation.Main.internal_main(Main.java:80) at com.databasepreservation.Main.main(Main.java:62)