hi i try to assign my local cluster to fleet-default but this error message appears

cannot upgrade cluster version from [v1.24.9+rke2r1] to [v1.24.4+rke2r1]. New version must be higher.

what does it mean ? which 'new' cluster version ? doc: https://fleet.rancher.io/troubleshooting#migrate-the-local-cluster-to-the-fleet-default-cluster