[INS-08109] Unexpected error occurred while validating inputs at state 'performChecks'

Trying to add a node back to the cluster. addnode worked fine for 11g. Now trying to add for 12c. I need to run addnode in silent mode. I run the command:

 ./addnode.sh -silent "CLUSTER_NEW_NODES={my_node_name}"

Getting the following error:

[WARNING] [INS-08109] Unexpected error occurred while validating inputs at state 'performChecks'.

  CAUSE: No additional information available.

  ACTION: Contact Oracle Support Services or refer to the software manual.

  SUMMARY:

    - java.lang.NullPointerException

Already checked the oraInst.loc and it is fine. We cannot use a GUI on this environment.