Attempting install of vCenter OPS 5.7.

All:

I am attempting to install vcOPS 5.7 in our environment. When going through the OVF deployment wizard I am receiving the error that "The operation is not supported on the object", when selecting a host to place the vAPP on?

I am installing on a host running ESXi 5.1.0, 1117900.

The host is part of our cluster. DRS is not on. Does it need to be for this to install?

Any and all help is very much appreciated!