[ovirt-users] Failed to upgrade from 4.1 to 4.2 - Postgre version required

Hi Ovirt users, I'm trying to upgrade my Ovirt from version 4.1 to 4.2, but I'm stuck when issuing the command *engine-setup* which returns the following errors : Upgrading PostgreSQL *[ ERROR ] Failed to execute stage 'Misc configuration': Command '/opt/rh/rh-postgresql95/root/usr/bin/postgresql-setup' failed to execute* [ INFO ] Yum Performing yum transaction rollback [ INFO ] Rolling back to the previous PostgreSQL instance (postgresql). [ INFO ] Stage: Clean up Log file is located at /var/log/ovirt-engine/setup/ovirt-engine-setup-20180426122630-rpkrel.log [ INFO ] Generating answer file '/var/lib/ovirt-engine/setup/answers/20180426122823-setup.conf' [ INFO ] Stage: Pre-termination [ INFO ] Stage: Termination *[ ERROR ] Execution of setup failed* Can anyone help to resolve this ? Thank you in advance. BR.