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java.lang.NullPointerException at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187) at com.google.common.collect.SingletonImmutableList.<init>(SingletonImmutableList.java:41) at com.google.common.collect.ImmutableList.copyFromCollection(ImmutableList.java:297) at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:260) at com.atlassian.jira.plugins.importer.external.beans.ExternalIssue.getExternalComponents(ExternalIssue.java:144) at com.atlassian.jira.plugins.importer.external.ExternalUtils.convertExternalIssueToIssue(ExternalUtils.java:724) at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.createIssue(DefaultJiraDataImporter.java:748) at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.importIssues(DefaultJiraDataImporter.java:672) at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.doImport(DefaultJiraDataImporter.java:298) at com.atlassian.jira.plugins.importer.imports.importer.impl.ImporterCallable.call(ImporterCallable.java:25) at com.atlassian.jira.plugins.importer.imports.importer.impl.ImporterCallable.call(ImporterCallable.java:14) at com.atlassian.jira.task.TaskManagerImpl$TaskCallableDecorator.call(TaskManagerImpl.java:359) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at com.atlassian.multitenant.impl.DefaultMultiTenantManager.runForTenant(DefaultMultiTenantManager.java:61) at com.atlassian.multitenant.juc.MultiTenantExecutors$WrappedRunnable.run(MultiTenantExecutors.java:160) at com.atlassian.jira.task.ForkedThreadExecutor$ForkedRunnableDecorator.run(ForkedThreadExecutor.java:249) at java.lang.Thread.run(Thread.java:662)