Hey Pradeep,
The structure of your yaml in the question isn't really clear, but my hunch is the value you've set to `cnSqlDbDialect` which is `"pgsql"` is causing the error.
Try setting it to `pgsql` without the double quotes.
`cnSqlDbDialect: pgsql`
Try doing that and let us know if the error persists.
Thanks, Scott.