Description of problem:
/var/log/httpd/error_log has the following error:
/opt/rh/ruby193/root/usr/bin/ruby: error while loading shared libraries: libruby.so.1.9: cannot open shared object file: No such file or directory

This is probably because ruby193-mod_passenger-3.0.12-18 is installed on the nodes for the ruby-1.9 cartridge.  It's installing that config file which leads to this error message.

The solution is probably to fix the ruby193-mod_passenger packaging.