Current default model seems to have a problem

Using the last nightly leads to the following error

2013-11-28 14:13:15,484 ERROR [org.ametys.skinfactory.SkinFactoryComponent] (http-bio-8080-exec-3;/plugins/core/servercomm/messages.xml) Unable to get theme value
java.net.MalformedURLException: Invalid URI : cms/WEB-INF/data/skins/work/demo/model.xml