Apache httpd failed to start with error "AH02311: Fatal error initialising mod_ssl, exiting"

Issue

• We are getting below error while starting apache webservices.

apache.example.com apache_error_log: [Wed Dec 01 15:47:00.779501 2021] [ssl:emerg] [pid 41081:tid 139919567444096] AH02311: Fatal error initialising mod_ssl, exiting. See /etc/httpd/|/usr/sbin/rotatelogs -l logs/ssl_error_log.%Y.%m.%d 86400 for more information
apache.example.com systemd: httpd.service: main process exited, code=exited, status=1/FAILURE
apache.example.com systemd: Unit httpd.service entered failed state.
apache.example.com systemd: httpd.service failed.

[Wed Dec 01 15:47:00.779491 2021] [ssl:emerg] [pid 41081:tid 139919567444096] AH02240: Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile] (/etc/httpd/conf.d/ssl.conf:7)