URGENT! pg_dump doesn't work!

Hello guys,

I have a problem with my postgres 7.2.1 database.
I can't perform a pg_dump one my database...
The message I get back is:

pg_dump: query to obtain list of tables failed: server closed the
connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
pg_dump failed on belbonedb_v2, exiting

Whe I connect to the database and do:

belbonedb_v2=# \dt networks

I get:

ERROR:  AllocSetFree: cannot find block containing chunk 4aee70


Can I fix this error?


Thanx!

Wim