Not all clustered features are currently selected. If the instance being clustered is unconfigured, confirm that all child ...

Not all clustered features are currently selected.  If the instance being clustered is unconfigured, confirm that all child features of the clustered components are included.  The features that are not included {0}.  If there are any child features that are not currently included, use the Prepare Image wizard to add them prior to attempting to cluster the instance again.