Using Ops Center on current Solaris 11.4 SRUs is a fight

Ops Center causes troubles, because it uses old software versions,
which are not available anymore by default on current Solaris 11.4 SRUs.

It requires python 2.7 & perl 5.22

On Control Domains using SRU48 or later you even need to open a Oracle Support Service Request to download a required Agent bugfix.

Here a few MOS Doc Ids with details about the workarounds

Ops Center 12.4: CDOM Agents fail to start after a Solaris upgrade to 11.4 SRU 48 (Doc ID 2892465.1)

Ops Center 12.4 upgrades to Solaris 11.4 SRU 39 on an EC will fail (Doc ID 2826475.1)

Ops Center Will Not Start After Upgrading to Solaris 11.4.3- SRU 30 - Svc:/application/scn/ajaxterm:default is Restarting Too Quickly (Doc ID 2760685.1)

Ops Center: Running With Solaris 11.4 SRU21 or Higher Precautions (Doc ID 2783309.1)

If you are happy with CLI tools, the JomaSoft VDCF framework is an alternative management software.
https://www.jomasoft.ch/vdcf/