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java.lang.NullPointerException: 	at java.lang.String.compareTo(String.java:998)	at java.lang.String.compareTo(String.java:90)	at java.util.TreeMap.compare(TreeMap.java:1093)	at java.util.TreeMap.getEntry(TreeMap.java:347)	at java.util.TreeMap.get(TreeMap.java:265)	at org.apache.turbine.util.security.GroupSet.getGroupByName(GroupSet.java:173)	at org.apache.turbine.services.security.BaseSecurityService.getGlobalGroup(BaseSecurityService.java:961)	at org.apache.turbine.services.security.TurbineSecurity.getGlobalGroup(TurbineSecurity.java:595)	at org.apache.turbine.util.security.TurbineAccessControlList.getPermissions(TurbineAccessControlList.java:148)	at de.tewisoft.aloe.turbine.ACLTool.init(ACLTool.java:43)	at org.apache.turbine.services.pull.TurbinePullService.initTool(TurbinePullService.java:736)	at org.apache.turbine.services.pull.TurbinePullService.populateWithRequestTools(TurbinePullService.java:456)	at org.apache.turbine.services.pull.TurbinePullService.populateContext(TurbinePullService.java:378)	at org.apache.turbine.services.velocity.TurbineVelocityService.getContext(TurbineVelocityService.java:250)	at org.apache.turbine.services.velocity.TurbineVelocity.getContext(TurbineVelocity.java:122)	at org.apache.turbine.modules.pages.VelocityPage.doBuildBeforeAction(VelocityPage.java:50)	at org.apache.turbine.modules.pages.DefaultPage.doBuild(DefaultPage.java:110)	at org.apache.turbine.modules.Page.build(Page.java:56)	at org.apache.turbine.modules.PageLoader.exec(PageLoader.java:104)	at org.apache.turbine.Turbine.doGet(Turbine.java:796)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:421)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)	at java.lang.Thread.run(Thread.java:595)