ORA-24544 When Creating a Standby From RAC One Node

I have a RAC One Node database running on node A and am attempting to create a Data Guard standby on node B using the following RMAN command -
duplicate target database for standby from active database
Error returned is -
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 03/10/2015 11:11:06
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-04014: startup failed: ORA-24544: Oracle RAC One Node instance is already running.
Can anyone advise ?
Thanks in advance

Hi,
ORA-24544: Oracle RAC One Node instance is already running.
Cause: An instance startup failed because an instance of the Oracle RAC One Node database was already running on one of the cluster nodes.
Action: In Oracle RAC One Node, avoid any attempt to start a second instance by any means while the instance is already running.
I have never used One Node RAC, but it looks like RMAN trying to start an offline instance of current One Node RAC on Node B.
HTH,
Pradeep

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RMAN-00571: ===========================================================
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RMAN-00571: ===========================================================
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Muhammad Ahmad wrote:
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user10191672 wrote:
Hi all,
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