Apache module problem

[Dru Lee Parsec]

Hi folks. I have these lines in my httpd.conf file

## mod_jserv has to be _BEFORE_ mod_rewrite
<IfDefine HAVE_JSERV>
LoadModule jserv_module /usr/lib/apache/mod_jk.so
</IfDefine>

And the module mod_jk.so DOES exist in that directory. But when I try to start apache with this command:

/etc/rc.d/init.d/httpd start

I get this error :

Syntax error on line 77 of /etc/httpd/conf/httpd.conf
Can't locate API module structure 'jserv_module' in file /usr/lib/apache/mod_jk.so: /usr/lib/apache/mod_jk.so: undefined symbol: jserv_module

Any help would be greatly appreciated.