Insufficient configured resources to satisfy the desired vSphere HA failover

Dear all

Hi

there are 2 options in cluster setting for admission control :

Host failures cluster tolerates which i set that on 2 hosts

and the other is Define host failover capacity by. that i set that on Cluster resource percentage

according attach pic

now

1- Is that mandatory to config both of them or just set Host failures cluster tolerates is enough ?

now show this warning on my cluster

i want sure the problem is for my configure or others ?

Insufficient configured resources to satisfy the desired vSphere HA failover level on the cluster in Datacenter