If you have RAC system you need to verify your information is correct on configuration files.

To can see it run below command as oracle user

[oracle@Node1~]$ emca -config dbcontrol db -repos create -cluster

As you can see we need to change it

Run Below command to change it

$emca -reconfig dbcontrol -cluster -EM_NODE node2 -EM_NODE_LIST node2

After you enter related information config will be change as follow