I am trying to start Oracle http server (Apache) which comes with Oracle application server. I am getting following errors in errorlog.

[warn] pid file /oracle/product/..../Apache/Apache/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?

I tried starting it using opmnctl, apachectl but no help.
I also, removed / deleted the file httpd.pid before restarting but same error.

Any help is appreciated.