My data center gets to 'problematic' state.

I have created a data center and a cluster. Also created a storage domain and attached it to the data center, and also installed two rhev-h host and have been approved by the rhevm for the data center.

But currently state of my datacenter is: problematic

state of storage domain is: inactive

state of host is: non_operational

I cannot activate the storagedomain or host. What's the situation of my data center? How could I fix it?