What do these messages with -D mean?

[Barton L. Phillips]

I ran spamassassin -D and got the following in the debug output. Is this 
a problem? If so what should I do?

[27299] dbg: bayes: no dbs present, cannot tie DB R/O: 
/var/spool/MIMEDefang/mimedefang-bayes_toks
[27299] dbg: bayes: not scoring message, returning undef
[27299] dbg: bayes: opportunistic call attempt failed, DB not readable
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Barton L. Phillips
Applied Technology Resources, Inc.
Tel: (818)652-9850
Web: http://www.applitec.com