Core Data : BlogDemo tutorial : I must have missed something, but I don't know what...

FROM : John Joyce
DATE : Sat Jun 21 23:40:56 2008

I just worked through the BlogDemo core data app tutorial. The "Topics"
panel loads of course, but none of the "Topics" functionality is there.
I'm sure I've missed something, or mis-connected something, but I cannot
seem to find it...

When I run the demo app, I'm getting the following :
[Session started at 2008-06-21 16:27:03 -0500.]
2008-06-21 16:27:05.212 BlogDemo[1180] *** NSRunLoop ignoring exception
'[<NSManagedObject 0x3434e0> valueForUndefinedKey:]: this class is not key
value coding-compliant for the key topic.' that raised during posting of
delayed perform with target 3c4ac0 and selector 'invokeWithTarget:'
2008-06-21 16:27:05.244 BlogDemo[1180] *** NSRunLoop ignoring exception
'Cannot perform operation since entity with name '(null)' cannot be found'
that raised during posting of delayed perform with target 3c4c80 and
selector 'invokeWithTarget:'

Any ideas from this as to what I fumbled? Everything else is working.