Please help

[Dragos Pruteanu <pruteanu@xxxxxxxxxxxxxx>]

I try to restore a backup, but I got the following error:
pg_restore: [custom archiver] could not read data block -- expected 
4096, got 2353

I run
pg_ctl (PostgreSQL) 8.0.3

I've tried the same with different backups ( one day before or after ) ,
and I tried also with -i flag ( ignore version ), but I got the same error.

Thank you for help,
Dragos Pruteanu