Fix com.atlassian.crowd.integration.exception.InvalidAuthenticationException: User with username <> does not exist in any of the assigned directories of application <crucible>

The fisheye debug log is full of this error:
2010-04-07 15:21:32,647 INFO [btpool0-20] fisheye.app CrowdAuth-checkPassword - user not found
com.atlassian.crowd.integration.exception.InvalidAuthenticationException: User with username <> does not exist in any of the assigned directories of application <crucible>
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:501)
at org.codehaus.xfire.aegis.type.basic.BeanType.createFromFault(BeanType.java:235)
at org.codehaus.xfire.aegis.type.basic.BeanType.readObject(BeanType.java:105)
at org.codehaus.xfire.aegis.AegisBindingProvider.readParameter(AegisBindingProvider.java:169)
at org.codehaus.xfire.client.ClientFaultConverter.processFaultDetail(ClientFaultConverter.java:51)
at org.codehaus.xfire.client.ClientFaultConverter.invoke(ClientFaultConverter.java:32)
at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
at org.codehaus.xfire.client.Client.onReceive(Client.java:424)
at org.codehaus.xfire.transport.http.HttpChannel.sendViaClient(HttpChannel.java:139)
at org.codehaus.xfire.transport.http.HttpChannel.send(HttpChannel.java:48)
at org.codehaus.xfire.handler.OutMessageSender.invoke(OutMessageSender.java:26)
at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
at org.codehaus.xfire.client.Invocation.invoke(Invocation.java:79)
at org.codehaus.xfire.client.Invocation.invoke(Invocation.java:114)
at org.codehaus.xfire.client.Client.invoke(Client.java:336)
at org.codehaus.xfire.client.XFireProxy.handleRequest(XFireProxy.java:77)
at org.codehaus.xfire.client.XFireProxy.invoke(XFireProxy.java:57)
at $Proxy212.authenticatePrincipal(Unknown Source)
at com.atlassian.crowd.integration.service.soap.client.SecurityServerClientImpl.authenticatePrincipal(SecurityServerClientImpl.java:222)
at com.atlassian.crowd.integration.service.cache.AuthenticationManagerImpl.authenticate(AuthenticationManagerImpl.java:41)
at com.atlassian.crowd.integration.http.HttpAuthenticatorImpl.authenticate(HttpAuthenticatorImpl.java:320)
at com.cenqua.fisheye.user.crowd.CrowdAuth.checkPassword(CrowdAuth.java:105)
at com.cenqua.fisheye.user.UserManager.getOrImportUser(UserManager.java:455)
at com.cenqua.fisheye.user.UserManager.loginWithSanitizedUserName(UserManager.java:329)
at com.cenqua.fisheye.user.UserManager.login(UserManager.java:322)
at com.cenqua.fisheye.web.security.UserDetector.tryBasicAuthentication(UserDetector.java:116)
at com.cenqua.fisheye.web.security.UserDetector.getUser(UserDetector.java:103)
at com.cenqua.fisheye.web.security.UserDetector.process(UserDetector.java:62)
at com.cenqua.fisheye.web.filters.TotalityFilter.doFilter(TotalityFilter.java:185)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at com.atlassian.studio.fisheye.web.SeraphRememberMeFilter.doFilter(SeraphRememberMeFilter.java:99)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at com.atlassian.security.auth.trustedapps.filter.TrustedApplicationsFilter.doFilter(TrustedApplicationsFilter.java:98)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:66)
at com.atlassian.oauth.serviceprovider.internal.servlet.OAuthFilter.doFilter(OAuthFilter.java:69)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:74)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:42)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:41)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:387)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:334)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
at com.cenqua.fisheye.web.filters.TotalityFilter.doFilter(TotalityFilter.java:160)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at com.atlassian.studio.fisheye.web.SeraphRememberMeFilter.doFilter(SeraphRememberMeFilter.java:99)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at com.atlassian.security.auth.trustedapps.filter.TrustedApplicationsFilter.doFilter(TrustedApplicationsFilter.java:98)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:66)
at com.atlassian.oauth.serviceprovider.internal.servlet.OAuthFilter.doFilter(OAuthFilter.java:69)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:74)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:42)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:41)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at com.cenqua.fisheye.web.filters.ProductInfoFilter.doFilter(ProductInfoFilter.java:36)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:41)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at com.cenqua.fisheye.web.filters.UpfrontFilter.doFilter(UpfrontFilter.java:73)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1200)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:387)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:865)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:451)
Caused by: org.codehaus.xfire.fault.XFireFault: User with username <> does not exist in any of the assigned directories of application <crucible>
at org.codehaus.xfire.fault.Soap11FaultSerializer.readMessage(Soap11FaultSerializer.java:31)
at org.codehaus.xfire.fault.SoapFaultSerializer.readMessage(SoapFaultSerializer.java:28)
at org.codehaus.xfire.soap.handler.ReadHeadersHandler.checkForFault(ReadHeadersHandler.java:111)
at org.codehaus.xfire.soap.handler.ReadHeadersHandler.invoke(ReadHeadersHandler.java:67)
at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
at org.codehaus.xfire.client.Client.onReceive(Client.java:406)
... 89 more