mod_perl & mod_jk

Hi,
        I'm trying to use mod_perl (1.99-07) with mod_jk (1.2) and Apache
(2.0.43). (and cannot move to 1.99-08 immediately)
When I try starting apache with both mod_perl & mod_jk enabled, I'm seeing
the following error :

$ sudo bin/apachectl start
Syntax error on line 8 of /opt/apache2/conf/mod_jk.conf:
Invalid command 'JkWorkersFile', perhaps mis-spelled or defined by a module
not included in the server configuration

Any ideas what might be happening ?..

Thanks
-Madhu