problem with Seaside

Hi,

i am trying to load SeasideFor WebToolKit (2.6b1.128.0,mbany from  
public store) into my 7.4.1 nc image (Mac OS 10.4.8 PowerPC). After  
having confirmed the Welcome to Seaside window the following error  
message pops up:

Seaside-WebToolKit: Error (Referent inaccssible)
evaluating postLoadBlock

What can I do?

Johannes