Failed to start virtual server

I'm in huge problem. After graceful reboot (bringing first down all 3 virtual servers) and then rebooting the host. Cloudmin started only 2 out of 3 servers.

3rd can't be started with simple message: Failed to start, no other description, logs are also not showing anything. I'm running host with fully updated CentOS v7 and Virtualmin.

Please advise how I can debug this problem in more detail, as I need this Virtual to be up.

Thank you.