[TYPO3-mvc] Fatal Error in blog_example

[Steffen Kamper]

Hi,

if i create a new blog i get
Catchable fatal error: Argument 1 passed to 
Tx_BlogExample_Domain_Model_Blog::setAdministrator() must be an instance 
of Tx_Extbase_Domain_Model_FrontendUser, string given in

vg Steffen