2014-06-02 16:49:05,110 ERROR ntapp.choosedialog.ContentAppChooseDialogPresenter: An error occurred while executing an action.
info.magnolia.ui.api.action.ActionExecutionException: Action execution failed for action: commit
        at info.magnolia.ui.api.action.AbstractActionExecutor.execute(AbstractActionExecutor.java:80)
        at info.magnolia.ui.dialog.BaseDialogPresenter.executeAction(BaseDialogPresenter.java:189)
        at info.magnolia.ui.dialog.BaseDialogPresenter$CommitDialogShortcutListener.handleAction(BaseDialogPresenter.java:271)
        at com.vaadin.event.ActionManager.handleAction(ActionManager.java:235)
        at com.vaadin.event.ActionManager.handleActions(ActionManager.java:213)
        at com.vaadin.ui.Panel.changeVariables(Panel.java:160)
        at com.vaadin.server.communication.ServerRpcHandler.changeVariables(ServerRpcHandler.java:403)
        at com.vaadin.server.communication.ServerRpcHandler.handleBurst(ServerRpcHandler.java:228)
        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:131)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at info.magnolia.cms.filters.ServletDispatchingFilter.doFilter(ServletDispatchingFilter.java:126)
        at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
        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.CompositeFilter.doFilter(CompositeFilter.java:65)
        at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
        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:89)
        at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        at info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:73)
        at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
        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:89)
        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:89)
        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:93)
        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:89)
        at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at info.magnolia.multisite.filters.MultiSiteFilter.doFilter(MultiSiteFilter.java:106)
        at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
        at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at info.magnolia.cms.filters.MultiChannelFilter.doFilter(MultiChannelFilter.java:82)
        at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        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 info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:104)
        at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
        at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at info.magnolia.enterprise.registration.RegistrationFilter.doFilter(RegistrationFilter.java:56)
        at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
        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:103)
        at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
        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:89)
        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:89)
        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:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassCastException: info.magnolia.ui.vaadin.integration.NullItem cannot be cast to info.magnolia.ui.vaadin.integration.jcr.JcrNodeAdapter
        at info.magnolia.dam.asset.field.factory.AssetsEnabledRichTextFieldFactory$3.onItemChosen(AssetsEnabledRichTextFieldFactory.java:140)
        at info.magnolia.ui.dialog.choosedialog.action.ChooseDialogAction.execute(ChooseDialogAction.java:67)
        at info.magnolia.ui.api.action.AbstractActionExecutor.execute(AbstractActionExecutor.java:78)
        ... 95 more