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java.lang.NullPointerException: 	at com.gitblit.wicket.panels.AccessPolicyPanel.updateModel(AccessPolicyPanel.java:163)	at com.gitblit.wicket.pages.EditRepositoryPage$3.onUpdate(EditRepositoryPage.java:628)	at org.apache.wicket.ajax.form.AjaxFormChoiceComponentUpdatingBehavior.respond(AjaxFormChoiceComponentUpdatingBehavior.java:179)	at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:312)	at org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:157)	at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)	at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1279)	at org.apache.wicket.RequestCycle.step(RequestCycle.java:1358)	at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1465)	at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)	at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:486)	at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:319)	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:88)	at com.gitblit.servlet.EnforceAuthenticationFilter.doFilter(EnforceAuthenticationFilter.java:99)	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:88)	at com.gitblit.servlet.ProxyFilter$1.doFilter(ProxyFilter.java:89)	at com.gitblit.servlet.ProxyFilter.doFilter(ProxyFilter.java:82)	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:88)	at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120)	at com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:133)	at com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:130)	at com.google.inject.servlet.GuiceFilter$Context.call(GuiceFilter.java:203)	at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:130)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)	at org.jasig.cas.client.tomcat.v7.CleanCas20CasAuthenticator.invoke(CleanCas20CasAuthenticator.java:43)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:610)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)	at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:193)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:745)