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java.lang.ClassCastException: java.lang.String	at com.atlassian.user.search.EntityNameAlphaComparator.compare(EntityNameAlphaComparator.java:29)	at java.util.TreeMap.compare(TreeMap.java:1093)	at java.util.TreeMap.put(TreeMap.java:465)	at java.util.TreeSet.add(TreeSet.java:210)	at com.atlassian.user.impl.osuser.OSUGroupManager.getMemberNames(OSUGroupManager.java:155)	at com.atlassian.user.impl.delegation.DelegatingGroupManagerTemplate.getMemberNames(DelegatingGroupManagerTemplate.java:81)	at bucket.user.DefaultUserAccessor.getMemberNames(DefaultUserAccessor.java:580)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:296)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:177)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)	at com.atlassian.spring.interceptors.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:20)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy26.getMemberNames(Unknown Source)	at com.atlassian.confluence.extra.userlister.model.UserList.getUsersByGroup(UserList.java:91)	at com.atlassian.confluence.extra.userlister.model.UserList.build(UserList.java:41)	at com.atlassian.confluence.extra.userlister.UserLister.execute(UserLister.java:91)	at com.atlassian.renderer.v2.macro.ResourceAwareMacroDecorator.execute(ResourceAwareMacroDecorator.java:45)	at com.atlassian.renderer.v2.components.MacroRendererComponent.processMacro(MacroRendererComponent.java:254)	at com.atlassian.renderer.v2.components.MacroRendererComponent.makeMacro(MacroRendererComponent.java:150)	at com.atlassian.renderer.v2.components.WikiContentRendererHandler.handleMacro(WikiContentRendererHandler.java:18)	at com.atlassian.renderer.v2.WikiMarkupParser.makeMacro(WikiMarkupParser.java:126)	at com.atlassian.renderer.v2.WikiMarkupParser.makeMacro(WikiMarkupParser.java:114)	at com.atlassian.renderer.v2.WikiMarkupParser.handlePotentialMacro(WikiMarkupParser.java:99)	at com.atlassian.renderer.v2.WikiMarkupParser.parse(WikiMarkupParser.java:60)	at com.atlassian.renderer.v2.components.MacroRendererComponent.render(MacroRendererComponent.java:46)	at com.atlassian.renderer.v2.V2Renderer.render(V2Renderer.java:53)	at com.atlassian.renderer.v2.V2RendererFacade.convertWikiToXHtml(V2RendererFacade.java:57)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:296)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:177)