onComponentTagBody / rendering errors

27.04.2011 16:29:12 ERROR [org.hippoecm.frontend.service.render.AbstractRenderService.onComponentTagBody():509] runtime plugin failure
org.apache.wicket.markup.MarkupException: Failed to handle: <wicket:container wicket:id="mode"/>. It might be that no resolver has been registered to handle this special tag. But it also be that you declared wicket:id=mode in your markup, but that you either did not add the component to your page at all, or that the hierarchy does not match.
[markup = jar:file:/home/cms/tomcat/webapps/cms/WEB-INF/lib/selectionplugins-addon-cms-2.04.00.jar!/org/onehippo/forge/selection/frontend/plugin/DynamicMultiSelectPlugin.html

27.04.2011 16:26:13 ERROR [org.hippoecm.frontend.service.render.AbstractRenderService.onComponentTagBody():509] runtime plugin failure
org.apache.wicket.WicketRuntimeException: Exception in rendering component: [Component id = entry]
...
Caused by: java.lang.IllegalArgumentException: Resource key must not be null
at org.apache.wicket.model.StringResourceModel.<init>(StringResourceModel.java:358)
at org.apache.wicket.model.StringResourceModel.<init>(StringResourceModel.java:326)
at org.hippoecm.frontend.plugins.cms.dashboard.EventModel$AssignmentWrapper.getObject(EventModel.java:196)
at org.hippoecm.frontend.plugins.cms.dashboard.EventModel$AssignmentWrapper.getObject(EventModel.java:172)

27.04.2011 16:33:36 ERROR [org.hippoecm.frontend.service.render.AbstractRenderService.onComponentTagBody():509] runtime plugin failure
org.apache.wicket.WicketRuntimeException: Exception in rendering component: [MarkupContainer [Component id = type]]
...
Caused by: java.lang.NullPointerException: List of choices is null - Was the supplied 'Choices' model empty?
at org.apache.wicket.markup.html.form.AbstractChoice.getChoices(AbstractChoice.java:214)
at org.apache.wicket.markup.html.form.ListMultipleChoice.onComponentTag(ListMultipleChoice.java:254)
at org.apache.wicket.markup.html.form.CheckBoxMultipleChoice.onComponentTag(CheckBoxMultipleChoice.java:359)
at org.apache.wicket.Component.renderComponent(Component.java:2661)