Trying to edit template 'Overzicht' results in Error on the console

Select a template (sjabloon) Nieuws or Overzicht in the default content namespace and an error is shown on the console. Preview is not shown.

Stacktrace:

18.05.2009 12:44:36 ERROR [org.hippoecm.frontend.editor.builder.TemplateTypeEdit
orPlugin.onModelChanged():164] Failed to update model
org.hippoecm.frontend.editor.builder.BuilderException: No prototype found
at org.hippoecm.frontend.editor.builder.TemplateBuilder.getPrototype(Tem
plateBuilder.java:277)
at org.hippoecm.frontend.editor.builder.TemplateTypeEditorPlugin.onModel
Changed(TemplateTypeEditorPlugin.java:133)
at org.hippoecm.frontend.editor.builder.TemplateTypeEditorPlugin.<init>(
TemplateTypeEditorPlugin.java:97)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct
orAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC
onstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at org.hippoecm.frontend.plugin.impl.PluginFactory.createPlugin(PluginFa
ctory.java:71)
at org.hippoecm.frontend.plugin.impl.PluginManager.start(PluginManager.j
ava:84)
at org.hippoecm.frontend.plugin.impl.PluginContext.start(PluginContext.j
ava:242)
at org.hippoecm.frontend.plugin.impl.ClusterControl.start(ClusterControl
.java:112)
at org.hippoecm.frontend.editor.viewer.ViewerPlugin.createTemplate(Viewe
rPlugin.java:90)
at org.hippoecm.frontend.editor.viewer.ViewerPlugin.onModelChanged(Viewe
rPlugin.java:68)
at org.apache.wicket.Component.modelChanged(Component.java:2105)
at org.hippoecm.frontend.editor.viewer.ViewerPlugin.<init>(ViewerPlugin.
java:57)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct
orAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC
onstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at org.hippoecm.frontend.plugin.impl.PluginFactory.createPlugin(PluginFa
ctory.java:71)
at org.hippoecm.frontend.plugin.impl.PluginManager.start(PluginManager.j
ava:84)
at org.hippoecm.frontend.plugin.impl.PluginContext.start(PluginContext.j
ava:242)
at org.hippoecm.frontend.plugin.impl.ClusterControl.start(ClusterControl
.java:112)
at org.hippoecm.frontend.plugins.cms.edit.CmsEditor.<init>(CmsEditor.jav
a:83)
at org.hippoecm.frontend.plugins.cms.edit.EditorFactory.newEditor(Editor
Factory.java:46)
at org.hippoecm.frontend.plugins.cms.edit.EditorManagerPlugin.onEvent(Ed
itorManagerPlugin.java:224)
at org.hippoecm.frontend.model.event.ObservableRegistry$ObservationConte
xt.notifyObservers(ObservableRegistry.java:76)
at org.hippoecm.frontend.model.ModelReference.setModel(ModelReference.ja
va:77)
at org.hippoecm.frontend.plugins.standards.browse.BrowseService$Document
ModelService.updateModel(BrowseService.java:54)
at org.hippoecm.frontend.plugins.standards.browse.BrowseService.updateDo
cumentModel(BrowseService.java:120)
at org.hippoecm.frontend.plugins.standards.browse.BrowseService.browse(B
rowseService.java:127)
at org.hippoecm.frontend.plugins.standards.browse.BrowseService.selectDo
cument(BrowseService.java:112)
at org.hippoecm.frontend.plugins.standards.browse.BrowseService$Document
ModelService.setModel(BrowseService.java:59)
at org.hippoecm.frontend.plugins.standards.browse.BrowseService$Document
ModelService.setModel(BrowseService.java:46)
at org.hippoecm.frontend.plugins.standards.list.AbstractListingPlugin.se
lectionChanged(AbstractListingPlugin.java:149)
at org.hippoecm.frontend.plugins.standards.list.ListCell$1.onEvent(ListC
ell.java:50)
at org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.ja
va:163)
at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(Abstract
DefaultAjaxBehavior.java:297)
at org.apache.wicket.request.target.component.listener.BehaviorRequestTa
rget.processEvents(BehaviorRequestTarget.java:100)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents
(AbstractRequestCycleProcessor.java:91)
at org.hippoecm.frontend.Main$6.processEvents(Main.java:283)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.j
ava:1175)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1252)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1353)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:493)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:
355)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.ja
va:200)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:188)
at org.hippoecm.frontend.plugins.login.ConcurrentLoginFilter.doFilter(Co
ncurrentLoginFilter.java:54)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:875)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFol
lowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:689)
at java.lang.Thread.run(Thread.java:595)