changeDBServer.sh to POSTGRESQL FATAL: role "root" does not exist

changeDBServer.sh to POSTGRESQL FATAL: role "root" does not exist

Hello..
I am unable to connect to ManageEngine SDP postgres when changing DB ..

************************************************************
                 DB Server Setup wizard
************************************************************

         1) Setup POSTGRESQL Server
         2) Setup MYSQL Server
         3) Setup MSSQL Server
         4) Quit
                Go to [1/2/3/4] : 1

     Host : localhost
     Port : 65432
     User : root
 Password : xxxxxx
 DB Name : servicedesk
--------------------------------------------------
FATAL: role "root" does not exist
--------------------------------------------------

DB Server status : [ Not Available ]
---- Creating Database------
========================================================

 database = servicedesk
========================================================

FATAL: role "root" does not exist
----------------------------
PostgreSQL Sever configuration added successfully.
[root@helpdesk bin]#


DB Server status : [ Not Available ]
---- Creating Database------
========================================================

 database = servicedesk
========================================================

Connection refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
----------------------------
PostgreSQL Sever configuration added successfully.
[root@helpdesk bin]#


what I missed?

please help me..

thanks


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