in reply to spork error

Have you tried asking the author &/or maintainer of Tree::DAG_Node ??

Or, alternatively, Acme::Spork may light the way for you - as a brief foray onto google (looking for perl & spork) revealed to me...

Update:

Added Acme::Spork

A user level that continues to overstate my experience :-))

In Section Seekers of Perl Wisdom