[ADMIN] Problems with upgrading 6.3.1 to 6.4

[PostgreSQL root user]

Hello!
I've got a problem with converting my old database from version 6.3.1 to
6.4. I tried pg_dumpall, but in the 6.4 psql cannot import it. It crashes
with error. Maybe someone knows any other conversion utility? I've got a
big database (pg_dumpall result is about 50MB), I am running linux 2.0.36.

Regards,
   - Grych