Node %1 appears to be a member of a cluster. It is either a member of an existing cluster or the node was not cleaned up ...

Node %1 appears to be a member of a cluster. It is either a member of an existing cluster or the node was not cleaned up after being evicted from a cluster. If you are sure this is not a member of a cluster run the Remove-ClusterNode cmdlet with the –Force parameter to clean up the cluster information from the node and then try to add it to the cluster again.