Oracle Message ORA-09978 - skxfqhdel: Error Disconnecting from another endpoint.

ERRORskxfqhdel: Error Disconnecting from another endpoint.
CAUSEThe process was unable to disconnect cleanly from another endpoint.
ACTIONCheck that the other node(s) are part of the cluster and operating properly. Check the instance and processes on the other node(s). Correct the operating system error and retry the operation.