title: Apache is not getting started after adding mod_proxy_cluster
body: <p>i am trying to use my HTTP server as load balancer to my Application-server cluster setup.
  so, i downloaded mod_proxy_cluster binaries and added below files to {$apache-home}/modules directory.</p>
  
  <pre><code> mod_proxy.so 
   mod_proxy_ajp.so 
   mod_slotmem.so 
   mod_manager.so 
   mod_proxy_cluster.so 
   mod_advertise.so
  </code></pre>
  
  <p>and also i added below lines in the httpd.conf file.</p>
  
  <pre><code> LoadModule slotmem_module modules/mod_slotmem.so
   LoadModule manager_module modules/mod_manager.so
   LoadModule proxy_cluster_module modules/mod_proxy_cluster.so
   LoadModule advertise_module modules/mod_advertise.so
  </code></pre>
  
  <p>and then i tried to restart the Apache server but it is not getting started.. i tried a couple of times.. but no luck...
  can anybody tell me where i am wrong?
  thank you, in advance.</p>