ops center installation queries

Hi,

Trying to install ops center version 12.3.0.1407 in V490 Solaris 10 server but encouter the following:

You do not have sufficient permissions to access the inventory '/u01/app/oracle/oraInventory'. Installation cannot continue. It is required that the primary group of the install user is same as the inventory owner group. Make sure that the install user is part of the inventory owner group and restart the installer.: Permission denied

OUI returned non-zero status of: 255

Error: 65280 when executing: cd /opt/ORCLsysman-db; ./cmd/silentOracleInstall.sh

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

Please fix the problem and then try this step again.

Please advise?

Thanks in advance.