vacuum error

Friends,

Help...

I have a small database with a few tables and a view. When I issue the
vacuum command, I get:

ERROR:  cannot read block 5 of pg_description_objoid_index: Input/output
error

Same thing happens when I try pg_dump or pg_dumpall as well. With
pg_dump, I can dump individual tables successfully, but I still get the
error.

Oh yeah, I can vacuum individual tables, no problem.

What can I do?

Thanks,

Brian
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