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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.<init>( at java.text.SimpleDateFormat.<init>( 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