节点3加入集群，数据库软件也安装完成
现在使用dbca -silent -addInstance -nodeList rac3 新增实例时报错：
Adding instance
PRCD-1051 : Failed to add instance to database ypt
PRCS-1011 : Failed to modify server pool ypt
PRCS-1014 : Server rac3 is already part of server pool ypt
DBCA_PROGRESS : DBCA Operation failed.
请问该如何处理？
或者怎么清楚rac3的注册信息