Trouble dumping "backing up" in 7.1.3 - Mailing list pgsql-admin

As you can probably figure out by now I want to back up my databases so
that I can upgrade to the latest version of PGSQL for a number of reasons.

I am having trouble though. See example below.

bash$ pg_dumpall > backup.data
getAggregates(): SELECT failed.  Explanation from backend: 'ERROR:
Attribute 'aggtransfn1' not found
'.
pg_dump failed on postgres, exiting
bash$



Any help would be greatly appresheated. I am using PG_DUMP