java.lang.NullPointerException: This exception has no message.

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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.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 java.lang.Thread.run(Thread.java:595)

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