cannot create poolableconnectionfactory(fatal role postgres does not exist )

[#1]

We are tying to insert data to pstgresql table using PutDatabaseRecord processor in Apache-NiFi.

In that we get

cannot create poolableconnectionfactory(fatal role postgres does not exist )

is this completely related to PostgreSQL(as describe below) or do we need to change some conf in NiFi side?

psql-fatal-role-postgres-does-not-exist

psql: FATAL: database “<user>” does not exist

[#2]

did you find solution for this error?