[CentOS] Network Bridge - error

Hi,

I'm new to CentOS. (I have tried Debian, Ubuntu, Devuan & Gentoo).
And also new to CloudStack.

I'm trying the Quick Installation Guide of CloudStack as pointed by Andrija
Panic of ShapeBlue
https://github.com/apache/cloudstack-documentation/blob/master/source/quickinstallationguide/qig.rst

At Configuring the Network topic, I got an error:

[root at localhost ~]# systemctl restart network
Job for network.service failed because the control process exited with
error code.  See "systemctl status network.service" and "journalctl -xe"
for details.

systemctl status network.service
https://pastebin.com/KzBqJN65

journalctl -xe
https://pastebin.com/PLQGuLeR