Rotate log in mod_perl

[Shibi NS]

My httpd.conf has following

    <Perl>
    $ErrorLog       = " |bin/rotatelogs
$config->{log_file}.%Y-%m-%d-%H_%M_%S 5M";
    #$TransferLog    = " |bin/rotatelogs
$config->{log_accessfile}.%Y-%m-%d-%H_%M_%S 5M";
    </Perl>

But server start fails

 $parms->add_config() has failed: ErrorLog takes one argument, The filename
of the error log at
/src/linux/lib/perl5/site_perl/5.8.8/i686-linux-64int/Apache2/PerlSections.pm
line 215.\n

Where $config->{log_file} is automated file name based on my server name

Any idea how can I get rid of it

--Shibi Ns--