while bamboo imports backup data it tries to inject local hibernate users into the crowd repository.

If bamboo is integrated with crowd (atlassian-user.xml) and if There are some residual users in bamboos local repository (hibernate) they are added (pushed) into crowd.
179 13:44:25,059 INFO [STDOUT] 2008-11-13 13:44:25,052 ERROR [ajp-jbbamb.austrac.gov.au%2F127.0.0.43-8009-2] [ImportExportManagerImpl] Exception occurr
179 ed during import
180 com.atlassian.core.exception.InfrastructureException: com.atlassian.user.impl.DuplicateEntityException: User [aharvey] already exists in Crowd Repos
180 itory
181 at com.atlassian.bamboo.user.BambooUserManagerImpl.injectUser(BambooUserManagerImpl.java:434)
182 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
183 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
184 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
185 at java.lang.reflect.Method.invoke(Method.java:585)
186 at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
187 at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
188 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
etc.
etc
324 tion overridden by commit exception
325 java.lang.Exception: Import has failed. Errors encountered while importing. This Bamboo instance may be corrupt.
326 at com.atlassian.bamboo.migration.ImportExportManagerImpl$2.call(ImportExportManagerImpl.java:118)
327 at com.atlassian.bamboo.migration.ImportExportManagerImpl$2.call(ImportExportManagerImpl.java:86)
328 at com.atlassian.bamboo.buildqueue.manager.LocalAgentManagerImpl.executeIfIdle(LocalAgentManagerImpl.java:405)
329 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
330 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
331 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
332 at java.lang.reflect.Method.invoke(Method.java:585)