Oracle : Ошибка ORA-19861

"additional backup pieces cannot be validated in this conversation"
*Cause: The user tried to add new pieces to the list of files
being validated after the validation had already been
performed. In a validation conversation, the list can
only be validated once.
*Action: Add all the backup pieces to the list before validating,
or start a new validation conversation for the remaining pieces.

Попробовать перевести

Поискать эту ошибку на форуме