>When I said "define" I meant "choose" a form that would appear every time
>that error happened
>
>This error means "bad table" and I got many costumers with bad table
>I am doing something wrong ?
>
>Moises


More probably your customers are doing something wrong. It means bad table, not really a user data table but a VFP form (or report). As you know most VFP objects such as tables, classes and reports are actually kept in tables albeit with a name different than DBF. If one of them becomes corrupted or unstable, you'd get this error, saying that it cannot open the form because it cannot read a record in the underlying table.

Do your customers have a UPS unit on each workstation? Do they unplug their computer without shutting down? etc.