Problem with MailWatch Logging

[Fajar]

Sorry if I'm posting in wrong mailling list, maybe someone can help me.

I think I mess with /linux mailscanner installation, when I'm adding 
mailwatch.pm into custom function,
the message not logged into database. I saw this message :
Could not use Custom Function code 
MailScanner::CustomConfig::InitMailWatchLogging, it could not be "eval"ed. 
Make sure the module is correct with perl -wc
Can someone point me how to solve this?

Thanks in advance.

Fajar