Adding node to RAC database that has physical standby

 I'm in the process of adding a 3rd node to a RAC database (primary) that has a working physical standby. It doesn't seem to like this. Getting errors related to the standby archive dest. Do I need to remove the standby before extending the RAC?

I'm getting the following error from DBCA when I try to add the instance on the new RAC node:

Failed to create directory ""(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=tcp)(HOST=hdoradb06.solar.cat.com)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=t3icsb_XPT)(INSTANCE_NAME=t3icsb)(SERVER=dedicated)))", LGWR ASYNC NOAFFIRM delay=0 OPTIONAL max_failure=0 max_connections=1 reopen=300 db_unique_name="t3icsb" register net_timeout=180 valid_for=(online_logfile,primary_role)" on "hdracprd04", "Badly placed ()'s: failed"