PDNS Service Fails to Start

Hello Community, I've setup a stable server which was running from last 45 Days without any issues. Its load is also always below 2. Today, PDNS has stopped working completely. When restarting, It shows this: [root@server5 ~]# /scripts/restartsrv_pdns Waiting for "pdns" to start ""info [restartsrv_pdns] systemd failed to start the service "pdns" (The "/usr/bin/systemctl restart pdns.service --no-ask-password" command (process 25764) reported error number 1 when it ended.): Job for pdns.service failed because the control process exited with error code. See "systemctl status pdns.service" and "journalctl -xe" for details. "Waiting for named,mydns,nsd,pdns_server to shutdown ... not running. info [restartsrv_pdns] systemd failed to start the service "pdns" (The "/usr/bin/systemctl restart pdns.service --no-ask-password" command (process 25777) reported error number 1 when it ended.): Job for pdns.service failed because the control process exited with error code. See "systemctl status pdns.service" and "journalctl -xe" for details. "failed. Cpanel::Exception::Services::StartError Service Status undefined status from Cpanel::ServiceManager::Services::Pdns Service Error (XID mgqwas) The "pdns" service failed to start. Startup Log Sep 15 18:05:40 server5 systemd[1]: Failed to start PowerDNS Authoritative Server. Sep 15 18:05:40 server5 systemd[1]: Unit pdns.service entered failed state. Sep 15 18:05:40 server5 systemd[1]: pdns.service failed. pdns has failed. Contact your system administrator if the service does not automagically recover.
There have been no Modifications in its Configuration or Any Other Configuration. Journalctl Shows: [root@server5 ~]# journalctl -xe -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit pdns.service has begun starting up. Sep 15 18:02:35 server5 systemd[2740]: Failed at step NAMESPACE spawning /usr/sbin/pdns_server: Invalid argument -- Subject: Process /usr/sbin/pdns_server could not be executed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- The process /usr/sbin/pdns_server could not be executed and failed. -- -- The error number returned by this process is 22. Sep 15 18:02:35 server5 systemd[1]: pdns.service: main process exited, code=exited, status=226/NAMESPACE Sep 15 18:02:35 server5 systemd[1]: Failed to start PowerDNS Authoritative Server. -- Subject: Unit pdns.service has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit pdns.service has failed. -- -- The result is failed. Sep 15 18:02:35 server5 systemd[1]: Unit pdns.service entered failed state. Sep 15 18:02:35 server5 systemd[1]: pdns.service failed.
This Log shows problem is: Failed at step NAMESPACE spawning /usr/sbin/pdns_server: Invalid argument
Uptill now, I haven't got solution to this problem. I have tried the Following: 1. Changed Nameserver Selection to BIND and changed it again to PowerDNS.(Currently, Server is running on BIND) 2. YUM UPDATE 3. UPCP Update from Version 96 to Version 98 4. Rebooted server This problem happened randomly without even interference to Configurations or any Modifications. Anyone who can suggest what am I missing here?