Error while starting httpd service with mod_ssl enabled.

Issue

• While starting httpd service with mod_ssl enabled, the following error is displayed:

suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[error] Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile] ((null):0)

• httpd fails to start and the following is displayed in ssl_error_log:

[Wed Apr 02 07:40:30 2014] [error] Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile] (/etc/httpd/conf.d/ssl.conf:74)
[Wed Apr 02 07:52:31 2014] [error] Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile] (/etc/httpd/conf.d/ssl.conf:74)
[Wed Apr 02 07:56:06 2014] [error] Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile] (/etc/httpd/conf.d/ssl.conf:74)
[Wed Apr 02 07:58:52 2014] [error] Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile] (/etc/httpd/conf.d/ssl.conf:74)
[Wed Apr 02 08:00:55 2014] [error] Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile] (/etc/httpd/conf.d/ssl.conf:74)