pg_upgrade error

hello there,

we are getting struck with this error while upgrading while upgrading from
9.1 to 9.2

-bash-4.1$ clear
-bash-4.1$ /usr/pgsql-9.2/bin/pg_upgrade -c
--old-datadir=/var/lib/pgsql/9.1/data
--new-datadir=/var/lib/pgsql/9.2/data --old-bindir=/usr/pgsql-9.1/bin
--new-bindir=/usr/pgsql-9.2/bin
Performing Consistency Checks
-----------------------------
Checking current, bin, and data directories ok
Checking cluster versions ok
Checking database user is a superuser ok
Checking for prepared transactions ok
Checking for reg* system OID user data types ok
Checking for contrib/isn with bigint-passing mismatch ok
Checking for presence of required libraries ok
Checking database user is a superuser ok

*Only the install user can be defined in the new cluster.*
*Failure, exiting*

*Can anyone help me in this regard..*

--
Regards,
Ramesh Eslavath