[Postgresql 8.4.2] problem restoring data

Hi
I want to restore a large database (5GB) from a backup (dump postgresql)
When the process arrive to the largest table, it stops with this output

"pg_restore: [custom archiver] could not uncompress data: too many length or distance symbols"

i do the dump with "pg_dump -Fc"

Does someone have an idea on this?

Thank you

Regards,
Fida