undefined value

[Sven Eric Panitz]

yesterday evening I was playing for the first time with the ObjectIO
library. It worked out fine and I had some fun.

But when I tried to access the global state at some point
I got some runtime error.
It is something like:
'trying to evaluate undefined value'.

This sounds a bit like a NullPointerException in Java to me. What does
it mean? I thought in functional languages we got rid of these things.

Sven Eric