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This exception has no message.
java.lang.NullPointerException: 	at java.util.AbstractCollection.addAll(AbstractCollection.java:333)	at com.atlassian.jira.imports.project.util.XMLEscapeUtil.unicodeInPlaceEncode(XMLEscapeUtil.java:201)	at com.atlassian.jira.imports.project.util.XMLEscapeUtil.unicodeInPlaceEncode(XMLEscapeUtil.java:154)	at com.atlassian.jira.util.xml.XMLEscapingReader.read(XMLEscapingReader.java:66)	at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)	at org.apache.xerces.impl.XMLEntityScanner.peekChar(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanCDATASection(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)	at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)	at com.atlassian.jira.bc.dataimport.DefaultDataImportService.parseXmlAndValidateBackupData(DefaultDataImportService.java:303)	at com.atlassian.jira.bc.dataimport.DefaultDataImportService.doImport(DefaultDataImportService.java:233)	at com.atlassian.jira.web.action.setup.DataImportAsyncCommand.call(DataImportAsyncCommand.java:65)	at com.atlassian.jira.web.action.setup.DataImportAsyncCommand.call(DataImportAsyncCommand.java:28)	at com.atlassian.jira.task.ImportTaskManagerImpl$TaskCallableDecorator.call(ImportTaskManagerImpl.java:147)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)	at java.util.concurrent.FutureTask.run(FutureTask.java:166)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)	at java.util.concurrent.FutureTask.run(FutureTask.java:166)	at com.atlassian.multitenant.impl.DefaultMultiTenantManager.runForTenant(DefaultMultiTenantManager.java:61)	at com.atlassian.multitenant.juc.MultiTenantExecutors$WrappedRunnable.run(MultiTenantExecutors.java:160)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:722)