rhevm-upgrade fails due to 'Can't create trust store'

Issue

• rhevm-upgrade fails due to 'Can't create trust store'

# rhevm-upgrade -u

Checking for updates... (This may take several minutes)...[ DONE ]
10 Updates available:
...
Stopping ovirt-engine service...                     [ DONE ]
Stopping DB related services...                      [ DONE ]
Cleaning async tasks...                              [ DONE ]
Pre-upgrade validations...                           [ DONE ]
Backing Up Database...                               [ DONE ]
Rename Database...                                   [ DONE ]
Updating rpms...                                     [ DONE ]
Updating Database...                                 [ DONE ]
Restore Database name...                             [ DONE ]
Preparing CA...                                      [ ERROR ]

 **Error: Upgrade failed, rolling back**
 **Reason: Error: Can't create trust store**

Restoring CA...                                      [ DONE ]
Restoring Database...                                [ DONE ]
Rolling back rpms...
Starting ovirt-engine service...                     [ DONE ]
Error: Upgrade failed.
please check log at /var/log/ovirt-engine/ovirt-engine-upgrade_20xx_xx_xx_xx_xx_xx.log
* DB Backup available at  /var/lib/ovirt-engine/backups/ovirt-engine_db_backup_20xx_xx_xx_xx_xx_xx.sql