RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 02/13/2011 14:51:58
RMAN-06054: media recovery requesting unknown log: thread 1 seq 2 lowscn 547146
This Error Happened Sometimes When you try to restore rman backup from Real Application
Cluster To single Node
Solution
RMAN > recover database noredo;
Thank you
Osama mustafa
Hope This is useful .