[racket] In universe, what does this mean?

When using universe I encountered the following error:

         World to remove for mail list not found

What does this mean?

I can trace to:

(make-bundle (make-univ empty INIT-WORLD) empty (univ-worlds u))

univ is a structure that contains a list of iworlds and a structure
called world.

In essence, I am trying to disconnect all worlds from the
server/universe when a game ends. It was my understanding this should
result in the server restarting. Instead, the server disappears with
the above error is reported.

Any pointers welcomed. :-)

-- 

Cheers,

Marco

Have a´¨)
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(¸.·´ (¸.·´ * wonderful day! :)