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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)