Your hardware lease period is expired, and you have tried to destroy the cluster to clear the data off the cluster, but the cluster was not destroyed completely?

Successful cluster destroy requires to have a clean environment. Clean out cluster config and cluster data. This operation will completely erase all data and all metadata, and each node will no longer belong to a cluster. 

There are some situations where cluster destroy does not succeed, especially if cluster destroy is executed while one of the nodes is down.

In that case please follow this document  KB 3436