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java.lang.ClassCastException: 	at com.atlassian.jira.issue.customfields.impl.AbstractMultiCFType.createValue(AbstractMultiCFType.java:94)	at com.atlassian.jira.issue.fields.CustomFieldImpl.createValue(CustomFieldImpl.java:452)	at com.atlassian.jira.imports.importer.impl.DefaultJiraDataImporter.importIssues(DefaultJiraDataImporter.java:534)	at com.atlassian.jira.imports.importer.impl.DefaultJiraDataImporter.doImport(DefaultJiraDataImporter.java:104)	at com.atlassian.jira.imports.importer.impl.ImporterThread.run(ImporterThread.java:21)