No template found for Base Document in defaultcontent

Steps:
Log in to CMS as 'admin'
Go 'To the documents'
Open the 'Configuration' slider
Click on defaultcontent
Click on Base Document

Act:
This leads to a series of exceptions starting with (the rest is attached):

22.01.2010 12:24:25 ERROR [org.hippoecm.frontend.editor.builder.TemplateTypeEditorPlugin.<init>():131] No template found to display type

(...)

22.01.2010 12:24:25 WARN [org.hippoecm.frontend.plugin.impl.PluginContext.registerService():214] plugin <unknown> is registering a service when stopping; ignoring

Exp:
I was not expecting that, as it does not occur for the other elements that are address, Article, Event, News, Overview.