SEVERE: 
java.lang.ClassCastException: info.magnolia.module.site.ConfiguredSite cannot be cast to info.magnolia.module.templatingkit.sites.Site
	at info.magnolia.module.templatingkit.functions.STKTemplatingFunctions.site(STKTemplatingFunctions.java:232)
	at info.magnolia.module.templatingkit.templates.STKTemplateAvailability.isAvailable(STKTemplateAvailability.java:71)
	at info.magnolia.rendering.template.assignment.MetaDataBasedTemplateDefinitionAssignment.isAvailable(MetaDataBasedTemplateDefinitionAssignment.java:168)
	at info.magnolia.rendering.template.assignment.MetaDataBasedTemplateDefinitionAssignment.isTemplateAvailable(MetaDataBasedTemplateDefinitionAssignment.java:157)
	at info.magnolia.rendering.template.assignment.MetaDataBasedTemplateDefinitionAssignment.getAvailableTemplates(MetaDataBasedTemplateDefinitionAssignment.java:148)
	at info.magnolia.pages.app.dnd.TemplateTypeRestrictionDropConstraint.allowedAsChild(TemplateTypeRestrictionDropConstraint.java:83)
	at info.magnolia.pages.app.dnd.TemplateTypeRestrictionDropConstraint.checkIfAllowedAsChildOfTargetItemParent(TemplateTypeRestrictionDropConstraint.java:128)
	at info.magnolia.pages.app.dnd.TemplateTypeRestrictionDropConstraint.allowedBefore(TemplateTypeRestrictionDropConstraint.java:110)
	at info.magnolia.ui.workbench.tree.drop.TreeViewDropHandler.moveNode(TreeViewDropHandler.java:185)
	at info.magnolia.ui.workbench.tree.drop.TreeViewDropHandler.drop(TreeViewDropHandler.java:117)
	at com.vaadin.server.DragAndDropService.handleDropRequest(DragAndDropService.java:135)
	at com.vaadin.server.DragAndDropService.changeVariables(DragAndDropService.java:101)
	at com.vaadin.server.communication.ServerRpcHandler.changeVariables(ServerRpcHandler.java:486)
	at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:305)
	at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:184)
	at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:92)
	at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
	at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1408)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:350)
	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:79)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	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:79)
	at info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:69)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:58)
	at info.magnolia.module.cache.executor.CompositeExecutor.processCacheRequest(CompositeExecutor.java:67)
	at info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:170)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:74)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	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:79)
	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:79)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	at info.magnolia.cms.security.SecurityCallbackFilter.doFilter(SecurityCallbackFilter.java:80)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:94)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.module.site.filters.SiteMergeFilter.doFilter(SiteMergeFilter.java:119)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.multisite.filters.MultiSiteFilter.doFilter(MultiSiteFilter.java:105)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	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:79)
	at info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:73)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	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:79)
	at info.magnolia.enterprise.registration.RegistrationFilter.doFilter(RegistrationFilter.java:63)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	at info.magnolia.module.devicedetection.filter.DeviceDetectionFilter.doFilter(DeviceDetectionFilter.java:71)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.personalization.preview.filter.PreviewFilter.doFilter(PreviewFilter.java:92)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81)
	at info.magnolia.personalization.trait.AbstractTraitDetectorFilter.doFilter(AbstractTraitDetectorFilter.java:61)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.personalization.trait.AbstractTraitDetectorFilter.doFilter(AbstractTraitDetectorFilter.java:61)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:112)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	at info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:128)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79)
	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:107)
	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: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.core.StandardContextValve.invoke(StandardContextValve.java)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
	at org.apache.catalina.core.StandardHostValve.__invoke(StandardHostValve.java:170)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
	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:408)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)