I didn't look too deeply, but it seems to me that LeakTracer 0.07 fails on ancient perls (like yours), but 0.06 and earlier were fine.
Upgrade your perl if possible, or install an earlier version of LeakTracer.
Report it as a bug in any event (and you might even get it fixed).
Perl: perlintro perlretut perldoc Basic debugging checklist Yes, even you can use CPAN
PerlMonks: How do I post a question effectively? Markup in the Monastery How do I post a question effectively? I know what I mean. Why don't you?
General: How To Ask Questions The Smart Way What every computer scientist should know about floating-point arithmetic
To Be Continued...