Problem with spamassassin

[Vittorio <vdemart@supereva.it>]

As an absolute beginner with spamassassin, I check my mail by means of
procmail and spamd (started at boot time). In a nutshell it seems all to work but....

1) Procmail warns that:
"procmail: Skipped ". All servers run spamd(1) so users should"
What steps should I take?

2) the console is flooded by the following warning: 

"Cannot open bays_path $HOME/.spamassassin/bayes R/W: file exists" AND
"Cannot open bayes_path $HOME/.spamassassin/bayes R/O: Inappropriate
ioctl for device"

What does it mean and what should I do?

Ciao
Vittorio