I am having a issue in running engine-setup

[0day@localhost ovirt-engine]$ $HOME/ovirt-engine/bin/engine-setup
[ INFO  ] Stage: Initializing
          Setup was run under unprivileged user this will produce development installation do you wish to proceed? (Yes, No) [No]: yes
[ INFO  ] Stage: Environment setup
          Configuration files: ['/home/0day/ovirt-engine/etc/ovirt-engine-setup.conf.d/20-setup-ovirt-post.conf']
          Log file: /home/0day/ovirt-engine/var/log/ovirt-engine/setup/ovirt-engine-setup-20170917195313-29bb2o.log
          Version: otopi-1.7.1 (otopi-1.7.1-1.el7)
[ ERROR ] Failed to execute stage 'Environment setup': Cannot connect to Engine database using existing credentials: engine@localhost:5432
[ INFO  ] Stage: Clean up
          Log file is located at /home/0day/ovirt-engine/var/log/ovirt-engine/setup/ovirt-engine-setup-20170917195313-29bb2o.log
[ INFO  ] Generating answer file '/home/0day/ovirt-engine/var/lib/ovirt-engine/setup/answers/20170917195316-setup.conf'
[ INFO  ] Stage: Pre-termination
[ INFO  ] Stage: Termination
[ ERROR ] Execution of setup failed