ORA-38856: cannot mark instance UNNAMED_INSTANCE_2 (redo thread 2) as enabled

Hi,

I am using RMAN to duplicate a RAC database (two nodes) to a standby non-RAC dataabse on other node.

The RAC database is using ASM and non-RAC is using OMF.

The following command runs well until the last step to open restlog.

RMAN> connect target sys@prd1108;
RMAN> connect auxiliary sys@p1108sb1;

RMAN>
RUN
{
  SET NEWNAME FOR DATAFILE 1 TO '/u02/oradata/p1108sb1/system01.dbf';
  SET NEWNAME FOR DATAFILE 2 TO '/u02/oradata/p1108sb1/sysaux01.dbf';
  SET NEWNAME FOR DATAFILE 3 TO '/u02/oradata/p1108sb1/undotbs01.dbf';
  SET NEWNAME FOR DATAFILE 4 TO '/u02/oradata/p1108sb1/users01.dbf';