asterisk users - May 2011 - Unusual message

Hi, 

Needed to test follow-me this evening on Asterisk 1.6.2.17 and received the
following message:

== Spawn extension (international-US, 0114407590XXXXXX, 5) exited non-zero on
'Local /0114407590XXXXXX at aXX-a62a;2'
-- no live channels left. exiting. 

I have not seen that before. What does it mean ? -- 
Thanks, Phil 
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