NMA doesn't exist in 3.0 (part of the whole API change). From a quick grep, it looks like masses/corpora/mass-find-nonspam and tools/speedtest are still trying to use it (but they won't work, obviously).
<sigh>
Care to open a ticket?
Done:
<http://bugzilla.spamassassin.org/show_bug.cgi?id=3533>
