Cita: This message usually means that VFP cannot compile one of the metadata files (that is, a DBC, form, report, label or class library file). It typically pops up if the file in question is flagged as read-only, or if it is damaged in some way.
Fuente:
Enlace
Osea... fijate que tengas los permisos de escritura habilitados.
[EDIT] En
esta pagina de Microsoft dice lo mismo... permisos de escritura