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java.util.UnknownFormatConversionException: Conversion = ' ' at java.util.Formatter.checkText( at java.util.Formatter.parse( at java.util.Formatter.format( at java.util.Formatter.format( at java.lang.String.format( at com.atlassian.jira.plugins.importer.imports.importer.impl.FileImportLogger.log( at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.importProject( at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.doImport( at at at com.atlassian.jira.task.TaskManagerImpl$ at java.util.concurrent.FutureTask$Sync.innerRun( at at java.util.concurrent.Executors$ at java.util.concurrent.FutureTask$Sync.innerRun( at at com.atlassian.multitenant.impl.DefaultMultiTenantManager.runForTenant( at com.atlassian.multitenant.juc.MultiTenantExecutors$ at com.atlassian.jira.task.ForkedThreadExecutor$ at