The local computer is the only node left in the failover cluster that has not been upgraded, or it is a single-node failover ...

The local computer is the only node left in the failover cluster that has not been upgraded, or it is a single-node failover cluster. As part of the upgrade of the local computer, ownership of the failover cluster group must be transferred to the upgraded version of SQL Server. The only valid options for the {0} setting in this scenario are 1 or 2.