The clustered role {0} has a value other than NULL for the property "AntiAffinityClassNames." The value of this property ...

The clustered role {0} has a value other than NULL for the property "AntiAffinityClassNames." The value of this property is {1}.  In the event of a failover, the failover manager will attempt to fail the clustered role to a node that is not hosting another clustered role with the same value in AntiAffinityClassNames. This value can take higher priority over the Preferred Owners List for the clustered role. As an example, if it is preferable that a clustered file server fail over to a node that is not hosting another clustered file server, you can give the clustered file server the same value for AntiAffinityClassNames. When one of the clustered file servers fails, the failover manager will try to fail it over to a node that is not already hosting a file server.