#6 Throwable: ITab.getPanel() returned null. TabbedPanel [0:modules] ITab index [0]

[Anonymous]

hi

Download ubuntu-11.10-i386-LiveCD-dcm4chee-2.17.0.iso (731.7 MB), install virtualbox
open page http://yourubuntuserver:8080/dcm4chee-web3 login Admin Admin

error message

Internal error
Throwable: ITab.getPanel() returned null. TabbedPanel [0:modules] ITab index [0]
Page: class org.apache.wicket.Page

How can i fix the problem?
thx