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java.lang.IllegalArgumentException: Illegal pattern character 'Y'	at java.text.SimpleDateFormat.compile(	at java.text.SimpleDateFormat.initialize(	at java.text.SimpleDateFormat.(	at java.text.SimpleDateFormat.(	at com.atlassian.jira.imports.csv.PropertiesCsvMapper.init(	at com.atlassian.jira.imports.csv.MindProdCsvProvider.startSession(	at com.atlassian.jira.imports.csv.CsvDataBean.populateCache(	at com.atlassian.jira.imports.csv.CsvDataBean.refreshCache(	at com.atlassian.jira.imports.csv.CsvDataBean.getUsers(	at com.atlassian.jira.imports.importer.impl.DefaultJiraDataImporter.importUsers(	at com.atlassian.jira.imports.importer.impl.DefaultJiraDataImporter.doImport(	at