System Firewall FreePBX

Missing Requirements:
The File “/usr/lib/sysadmin/includes.php” must exist.

In custom installation on Centos 7 i have this error. Is there any way i can fix this problem ?
I really like to enable the system firewall because using
systemctl start firewalld is not working and i have added my public ip address on whitelist using this command: firewall-cmd --permanent --zone=trusted --add-source=

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Firewall requires System Admin, which may or may not work on your system as it’s only officially supported on Distro systems.

Thanks for replay on my post.
So if System Admin is not working can you guide me on how to add firewall rules based on the firewalld
all i need rules to drop all incoming connection and allow only list of ip address?

Other question about this problem, If i install on Debian OS will i have this problem or i can install system admin without problem ?

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