2013-09-09 04:40:55,741 ERROR .magnolia.ui.admincentral.AdmincentralErrorHandler: AdmincentralUI has encountered an unhandled exception.
com.vaadin.data.Buffered$SourceException
	at com.vaadin.ui.AbstractField.setValue(AbstractField.java:517)
	at com.vaadin.ui.AbstractSelect.setValue(AbstractSelect.java:698)
	at com.vaadin.ui.OptionGroup.setValue(OptionGroup.java:188)
	at com.vaadin.ui.AbstractSelect.changeVariables(AbstractSelect.java:494)
	at com.vaadin.ui.OptionGroup.changeVariables(OptionGroup.java:81)
	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:1352)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:238)
	at info.magnolia.ui.admincentral.AdmincentralVaadinServlet.service(AdmincentralVaadinServlet.java:122)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
	at info.magnolia.cms.filters.ServletDispatchingFilter.doFilter(ServletDispatchingFilter.java:129)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
	at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:70)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	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:153)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:76)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.filters.RangeSupportFilter.doFilter(RangeSupportFilter.java:84)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:60)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.security.SecurityCallbackFilter.doFilter(SecurityCallbackFilter.java:86)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:93)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.module.templatingkit.filters.SiteMergeFilter.doFilter(SiteMergeFilter.java:106)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.filters.MultiChannelFilter.doFilter(MultiChannelFilter.java:81)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:73)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
	at info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:104)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
	at info.magnolia.module.devicedetection.filter.DeviceDetectionFilter.doFilter(DeviceDetectionFilter.java:73)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:131)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
	at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
	at info.magnolia.cms.filters.SafeDestroyMgnlFilterWrapper.doFilter(SafeDestroyMgnlFilterWrapper.java:108)
	at info.magnolia.cms.filters.MgnlFilterDispatcher.doDispatch(MgnlFilterDispatcher.java:67)
	at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:108)
	at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:94)
	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.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.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1008)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
	at java.lang.Thread.run(Thread.java:680)
Caused by: com.vaadin.data.util.converter.Converter$ConversionException: Cannot convert class java.util.LinkedHashSet to class java.util.LinkedList
	at info.magnolia.ui.vaadin.integration.jcr.DefaultProperty.setValue(DefaultProperty.java:66)
	at info.magnolia.ui.form.field.transformer.basic.BasicTransformer.writeToItem(BasicTransformer.java:81)
	at info.magnolia.ui.form.field.transformer.TransformedProperty.setValue(TransformedProperty.java:67)
	at com.vaadin.ui.AbstractField.setValue(AbstractField.java:508)
	... 90 more