Jagga - 2004-05-27

Hi, I cann't save the state of the OpenCyc world by
(write-image "world/<filename>") before shutting down using
(exit). 

The error shown is:
Varaible world/<filename> is unbound.

I could save the state of OpenCyc world last week, but now it is not working, and I do not know, why? Can anyone help me ?
Thanks
Jagga