hello..

I just got that error now and I see this log trace in catalina.out

2016-03-07 15:14:07,316 ERROR 
.magnolia.ui.admincentral.AdmincentralErrorHandler: AdmincentralUI has 
encountered an unhandled exception.
com.vaadin.server.ServerRpcManager$RpcInvocationException: Unable to invoke 
method closeTab in 
info.magnolia.ui.vaadin.gwt.client.tabsheet.rpc.MagnoliaTabSheetServerRpc
        at 
com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:170)
        at 
com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:118)
        at 
com.vaadin.server.communication.ServerRpcHandler.handleBurst(ServerRpcHandler.java:214)
        at 
com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:111)
        at 
com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:91)
        at 
com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:37)
        at 
com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1371)
        at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:238)
        at 
info.magnolia.ui.admincentral.AdmincentralVaadinServlet.service(AdmincentralVaadinServlet.java:136)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
        at 
info.magnolia.cms.filters.ServletDispatchingFilter.doFilter(ServletDispatchingFilter.java:148)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        at 
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:65)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:68)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:58)
        at 
info.magnolia.module.cache.executor.CompositeExecutor.processCacheRequest(CompositeExecutor.java:66)
        at 
info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:152)
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:73)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.filters.RangeSupportFilter.doFilter(RangeSupportFilter.java:84)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
com.vavpro.security.QuickAccessRedirectFilter.doFilter(QuickAccessRedirectFilter.java:45)
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
com.vavpro.security.ForcePasswordChangeFilter.doFilter(ForcePasswordChangeFilter.java:58)
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:57)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        at 
info.magnolia.cms.security.SecurityCallbackFilter.doFilter(SecurityCallbackFilter.java:83)
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:94)
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.module.templatingkit.filters.SiteMergeFilter.doFilter(SiteMergeFilter.java:112)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.filters.MultiChannelFilter.doFilter(MultiChannelFilter.java:83)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:73)
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        at 
com.vavpro.security.AfterLoginFilter.doFilter(AfterLoginFilter.java:68)
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:127)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        at 
info.magnolia.module.devicedetection.filter.DeviceDetectionFilter.doFilter(DeviceDetectionFilter.java:71)
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:148)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:129)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
com.vavpro.security.LoginOverrideFilter.doFilter(LoginOverrideFilter.java:132)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at 
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:65)
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at 
info.magnolia.cms.filters.SafeDestroyMgnlFilterWrapper.doFilter(SafeDestroyMgnlFilterWrapper.java:106)
        at 
info.magnolia.cms.filters.MgnlFilterDispatcher.doDispatch(MgnlFilterDispatcher.java:66)
        at 
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:107)
        at 
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:93)
        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.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:612)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
        at 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
        at 
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:168)
        ... 103 more
Caused by: java.lang.NullPointerException
        at 
info.magnolia.ui.framework.app.AppInstanceControllerImpl$SubAppDetails.access$200(AppInstanceControllerImpl.java:107)
        at 
info.magnolia.ui.framework.app.AppInstanceControllerImpl.getSubAppEventBus(AppInstanceControllerImpl.java:275)
        at 
info.magnolia.ui.framework.app.AppInstanceControllerImpl.sendSubAppLifecycleEvent(AppInstanceControllerImpl.java:271)
        at 
info.magnolia.ui.framework.app.AppInstanceControllerImpl.onFocus(AppInstanceControllerImpl.java:262)
        at 
info.magnolia.ui.framework.app.AppInstanceControllerImpl.onClose(AppInstanceControllerImpl.java:281)
        at 
info.magnolia.ui.framework.app.DefaultAppView$1.closeTab(DefaultAppView.java:74)
        at 
info.magnolia.ui.vaadin.tabsheet.MagnoliaTabSheet$1.closeTab(MagnoliaTabSheet.java:68)
        ... 108 more

-- 
Context is everything: 
http://forum.magnolia-cms.com/forum/thread.html?threadId=62d70900-5384-44b8-a60d-b8c5fd1f395f


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