CSV issue import fails on user mapping

[ACL]

I'm trying to import issues from CSV and map CSV usernames to internal names on import using

{code}

settings.advanced.mapper.user : com.atlassian.jira.imports.csv.mappers.FirstInitialFirstNameUserMapper

{code}

but get the following error:

{code}

2011-11-02 16:10:13,054 ERROR - Failed to start import

java.lang.ClassCastException: com.atlassian.jira.imports.csv.mappers.FirstInitialFirstNameUserMapper cannot be cast to com.atlassian.jira.plugins.importer.imports.csv.mappers.ExternalUserMapper

at com.atlassian.jira.plugins.importer.imports.csv.CsvDataBean.populateCache(CsvDataBean.java:191)

at com.atlassian.jira.plugins.importer.imports.csv.CsvDataBean.refreshCache(CsvDataBean.java:168)

at com.atlassian.jira.plugins.importer.imports.csv.CsvDataBean.getAllProjects(CsvDataBean.java:156)

at com.atlassian.jira.plugins.importer.imports.csv.CsvDataBean.getSelectedProjects(CsvDataBean.java:162)

at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.getSelectedProjects(DefaultJiraDataImporter.java:1110)

{code}

[JustinA]

Do you have a sample of the CSV so that we can see what went wrong? Also, which version of JIRA and Importers plugin are you using?