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java.lang.IllegalArgumentException: Illegal pattern character 'Y' at java.text.SimpleDateFormat.compile(SimpleDateFormat.java:678) at java.text.SimpleDateFormat.initialize(SimpleDateFormat.java:497) at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:446) at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:427) at com.atlassian.jira.imports.csv.PropertiesCsvMapper.init(PropertiesCsvMapper.java:50) at com.atlassian.jira.imports.csv.MindProdCsvProvider.startSession(MindProdCsvProvider.java:48) at com.atlassian.jira.imports.csv.CsvDataBean.populateCache(CsvDataBean.java:122) at com.atlassian.jira.imports.csv.CsvDataBean.refreshCache(CsvDataBean.java:105) at com.atlassian.jira.imports.csv.CsvDataBean.getUsers(CsvDataBean.java:251) at com.atlassian.jira.imports.importer.impl.DefaultJiraDataImporter.importUsers(DefaultJiraDataImporter.java:223) at com.atlassian.jira.imports.importer.impl.DefaultJiraDataImporter.doImport(DefaultJiraDataImporter.java:94) at com.atlassian.jira.imports.importer.impl.ImporterThread.run(ImporterThread.java:21)