Bogofilter initialization problems

[Eric Mings]

Well after finally getting bogofilter installed I am having difficulty 
getting it to process my stored spam and nonspam mbx files. When I 
attempt the instructions to initialize I get:

[localhost:/Applications/BogoMailPrimer] elm% bogofilter -d . -s < 
Spam.mbox
bogofilter (db) open: ./goodlist.db: Invalid argument
bogofilter: Cannot initialize database good.

Not sure what I am  doing wrong. I am working on OSX  with the apple 
mail app files. Suggestions greatly appreciated.