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java.lang.IllegalArgumentException: username argument cannot be null or blank at org.apache.commons.lang.Validate.isTrue(Validate.java:157) at com.atlassian.crowd.integration.model.user.UserTemplate.<init>(UserTemplate.java:35) at com.atlassian.crowd.integration.model.user.UserTemplateWithAttributes.<init>(UserTemplateWithAttributes.java:11) at com.atlassian.crowd.integration.model.user.UserTemplateWithCredentialAndAttributes.<init>(UserTemplateWithCredentialAndAttributes.java:24) at com.atlassian.crowd.importer.mappers.csv.UserMapper.mapRow(UserMapper.java:49) at com.atlassian.crowd.importer.importers.CsvImporter.findUsers(CsvImporter.java:190) at com.atlassian.crowd.importer.importers.BaseImporter.importUsersGroupsAndMemberships(BaseImporter.java:195) at com.atlassian.crowd.importer.manager.ImporterManagerImpl.performImport(ImporterManagerImpl.java:35) at com.atlassian.crowd.console.action.dataimport.CsvConfirmation.doExecute(CsvConfirmation.java:39)