Apache OpenProject安装

我需要在Centos中安装open project，但安装时遇到以下错误。如何解决这个问题

[apache2] ./bin/preinstall
Loaded plugins: fastestmirror, universal-hooks
Loading mirror speeds from cached hostfile
 * EA4: 216.14.113.158
 * cpanel-addons-production-feed: 216.14.113.158
 * cpanel-plugins: 216.14.113.158
 * base: ftpmirror.your.org
 * epel: mirror.uic.edu
 * extras: ftpmirror.your.org
 * updates: ftpmirror.your.org
No package mod_ssl available.
Error: Nothing to do