pg_upgrade from 9.1.3 to 9.2 failed

I am trying to test the upgrade from my 9.1.3 db to 9.2 on ubuntu 10.10
server. I got error below when run the pg_upgrade command. What can I do
for this?

$ /opt/PostgreSQL/9.2/bin/pg_upgrade -b /opt/PostgreSQL/9.1/bin -B
/opt/PostgreSQL/9.2/bin -d /raid/pgsql -D /raid/pg92data
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
Creating catalog dump                                       ok
Checking for presence of required libraries                 ok
Checking database user is a superuser                       ok
Checking for prepared transactions                          ok

If pg_upgrade fails after this point, you must re-initdb the
new cluster before continuing.

Performing Upgrade
------------------
Analyzing all rows in the new cluster                       ok
Freezing all rows on the new cluster                        ok
Deleting files from new pg_clog                             ok
Copying old pg_clog to new server                           ok
Setting next transaction ID for new cluster                 ok
Resetting WAL archives                                      ok
Setting frozenxid counters in new cluster                   ok
Creating databases in the new cluster                       ok
Adding support functions to new cluster                     ok
Restoring database schema to new cluster                    ok
Removing support functions from new cluster                 ok
Copying user relation files
   /raid/pgsql/base/6087920/6088238
old and new databases "testdb" have a different number of relations
Failure, exiting