Username conflicts related to case

15:13:25: ERROR: Exception creating user "dave": com.atlassian.agmp.openid.users.mgmt.api.UserCreationException: Exception creating user "dave"
 at com.atlassian.agmp.openid.users.mgmt.jira.UserServiceImpl.createUsers(UserServiceImpl.java:247)
 at com.atlassian.agmp.integration.jira.poller.impl.SyncUserTaskFactoryImpl$BulkCreateUserTask.run(SyncUserTaskFactoryImpl.java:213)
 at com.atlassian.agmp.integration.jira.poller.impl.UserSynchronizerImpl.performQuietly(UserSynchronizerImpl.java:191)
 at com.atlassian.agmp.integration.jira.poller.impl.UserSynchronizerImpl.process(UserSynchronizerImpl.java:96)
 at com.atlassian.agmp.integration.jira.poller.impl.UserSynchronizerImpl.process(UserSynchronizerImpl.java:47)
 at com.atlassian.agmp.integration.jira.poller.impl.SyncJobImpl.process(SyncJobImpl.java:177)
 at com.atlassian.agmp.integration.jira.poller.impl.SyncJobImpl.run(SyncJobImpl.java:117)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
 at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
 at java.util.concurrent.FutureTask.run(FutureTask.java:138)
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
 at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
 at java.lang.Thread.run(Thread.java:662)
Caused by: com.atlassian.crowd.exception.InvalidUserException: User already exists
 at com.atlassian.crowd.manager.application.ApplicationServiceGeneric.addUser(ApplicationServiceGeneric.java:358)
 at com.atlassian.crowd.embedded.core.CrowdServiceImpl.addUser(CrowdServiceImpl.java:293)
 at com.atlassian.crowd.embedded.core.DelegatingCrowdService.addUser(DelegatingCrowdService.java:85)
 at com.atlassian.crowd.embedded.core.FilteredCrowdServiceImpl.addUser(FilteredCrowdServiceImpl.java:43)
 at sun.reflect.GeneratedMethodAccessor461.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$AbstractMultiTenantAwareInvocationHandler.invokeInternal(MultiTenantComponentFactoryImpl.java:181)
 at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$MultiTenantAwareInvocationHandler.invoke(MultiTenantComponentFactoryImpl.java:211)
 at $Proxy496.addUser(Unknown Source)
 at sun.reflect.GeneratedMethodAccessor461.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
 at $Proxy496.addUser(Unknown Source)
 at sun.reflect.GeneratedMethodAccessor461.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:154)
 at $Proxy496.addUser(Unknown Source)
 at com.atlassian.agmp.openid.users.mgmt.jira.UserServiceImpl$1.execute(UserServiceImpl.java:217)
 at com.atlassian.agmp.integration.common.crowd.impl.CrowdUserManagementCommandExecutorImpl.execute(CrowdUserManagementCommandExecutorImpl.java:29)
 at sun.reflect.GeneratedMethodAccessor2300.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
 at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
 at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
 at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
 at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
 at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
 at $Proxy2000.execute(Unknown Source)
 at com.atlassian.agmp.openid.users.mgmt.jira.UserServiceImpl.createUsers(UserServiceImpl.java:207)
 ... 14 more