can't create issues from incoming mail

I configured a PopService per instructions from Scott Farquhar. When the service was activated, I got the following exception. No issues were created.
This was with 2.0EAP6-#37

2003-02-13 08:32:46,979 DEBUG [service.services.pop.PopService] Message Subject: test
2003-02-13 08:32:46,980 DEBUG [service.util.handler.CreateIssueHandler] CreateIssueHandler.handleMessage
java.lang.IllegalArgumentException: Action '' not found
at webwork.action.factory.JavaActionFactory.getActionImpl(JavaActionFactory.java:63)
at webwork.action.factory.ScriptActionFactoryProxy.getActionImpl(ScriptActionFactoryProxy.java:54)
at webwork.action.factory.XMLActionFactoryProxy.getActionImpl(XMLActionFactoryProxy.java:56)
at webwork.action.factory.PrefixActionFactoryProxy.getActionImpl(PrefixActionFactoryProxy.java:101)
at webwork.action.factory.JspActionFactoryProxy.getActionImpl(JspActionFactoryProxy.java:53)
at webwork.action.factory.CommandActionFactoryProxy.getActionImpl(CommandActionFactoryProxy.java:62)
at webwork.action.factory.AliasingActionFactoryProxy.getActionImpl(AliasingActionFactoryProxy.java:96)
at webwork.action.factory.CommandActionFactoryProxy.getActionImpl(CommandActionFactoryProxy.java:62)
at webwork.action.factory.ContextActionFactoryProxy.getActionImpl(ContextActionFactoryProxy.java:36)
at webwork.action.factory.PrepareActionFactoryProxy.getActionImpl(PrepareActionFactoryProxy.java:37)
at webwork.action.factory.ParametersActionFactoryProxy.getActionImpl(ParametersActionFactoryProxy.java:46)
at webwork.action.factory.ChainingActionFactoryProxy.getActionImpl(ChainingActionFactoryProxy.java:44)
at webwork.action.factory.DefaultActionFactory.getActionImpl(DefaultActionFactory.java:92)
at webwork.action.factory.ActionFactory.getAction(ActionFactory.java:62)
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:101)
at com.atlassian.core.action.DefaultActionDispatcher.execute(DefaultActionDispatcher.java:38)
at com.atlassian.jira.service.util.handler.CreateIssueHandler.handleMessage(CreateIssueHandler.java:108)
at com.atlassian.jira.service.services.pop.PopService.run(PopService.java:101)
at com.atlassian.jira.service.JiraServiceContainer.run(JiraServiceContainer.java:63)
at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:51)
at org.quartz.core.JobRunShell.run(JobRunShell.java:160)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:268)