sa-learn error message

[Yuriy Padlyak <yura@cvt.com.ua>]

I've got this error:

$ sa-learn --spam 1193706642.H221893P4714.tenpostadsl.lviv.farlep.net:2,S
syntax error for eval function GREYLIST_ISWHITE: greylisting("( 'dir' =>
'/var/spool/sa-exim/tuplets'; 'method' => 'dir'; 'greylistsecs' =>
'1800'; 'dontgreylistthreshold' => 11; 'connectiphdr' => ' at
/usr/share/perl5/Mail/SpamAssassin/Conf/Parser.pm line 717.
Learned tokens from 1 message(s) (1 message(s) examined)

Can anyone help me identifying the source of it?
Thank you in advance.

Yuriy