ORA-00251: LOG_ARCHIVE_DUPLEX_DEST cannot be the same destination as string

ORA-00251: LOG_ARCHIVE_DUPLEX_DEST cannot be the same destination as  string string

Cause: The destination specified by the LOG_ARCHIVE_DUPLEX_DEST  parameter is the same
as the destination specified by an ALTER SYSTEM  ARCHIVE LOG START TO command.

Action: Specify a different destination for parameter LOG_ARCHIVE_DUPLEX_  DEST, or specify a different destination with the ALTER SYSTEM command.