wflogs - wrong filter expression

[Micha Feigin <michf@math.tau.ac.il>]

I get a daily message from cron daily stating that :
/etc/cron.daily/wflogs_report:
/usr/bin/wflogs: error: wrong filter expression.
run-parts: /etc/cron.daily/wflogs_report exited with return code 1
I tried running the script myself and didn't get any errors.
It is settup by debconf to produce email and regular output in human
form.
Any ideas what could be causing the problem (afraid I don't know what
more to send, but if anything else can help let me know).

I tried reconfiguring using dpkg-reconfigure to a different settings but
didn't help.