cannot delete secondary domain

[Christian Hügel]

Hi,

for some reason I´m not able to delete a secondary domain under 
Domains->System-Domainnames. If I klick the trashcan and then submit the 
domain entry is still there.
I tried to delete the domain via cli with:

  kolab delete-domain test.de

But i get a error: ERROR: u'Internal error'

Has anybody experienced this?

Thank you,

Christian