[Koha] Error while starting apache2 in Ubuntu 16.04

Dear all, I am getting the following error while starting the apache2 in Ubuntu-16.04. Job for apache2.service failed because the control process exited with error code. See "systemctl status apache2.service" and "journalctl -xe" for details. ​Kindly help With regards, DP Tripathi NIT Rourkela​