Redhat – Error using mod_jk in httpd: undefined symbol: ap_get_server_version

We just recently installed a new RHEL7 server. Inside of this server, we have a bunch of vhosts, and inside the vhosts there is a couple of lines that looks like this –

JkMount /rules_engine/rulesApi/rules/* rulesEngine
JkMount /api/* rulesEngine
JkMount /rules_editor/* rulesEngine

So in order to handle this, we use mod_jk inside of our apache configuration. However, when I try to start apache, I get the following error –

Syntax error on line 1 of /etc/httpd/conf.d/mod_jk.conf: Cannot load /etc/httpd/modules/mod_jk.so into server: /etc/httpd/modules/mod_jk.so: undefined symbol: ap_get_server_version

The mod_jk.conf file is inside of /etc/httpd/conf.d, and it looks like this –

LoadModule jk_module /etc/httpd/modules/mod_jk.so
JkWorkersFile /etc/httpd/conf.d/workers.properties
JkLogFile /var/log/httpd/mod_jk.log
Change to WARN or ERROR for Prod
JkLogLevel info
JkShmFile /var/log/httpd/mod_jk.shm
JkMount /rulesApi/rules/* rulesEngine
JkMount /api/* rulesEngine
JkMount /* rulesEditor
JkMount /rules_editor/* rulesEditor

Any ideas as to what that error means, and how I can get httpd to start?

Thanks.