VIX and ESXi 4.1 - license issue ?

Hi,

I am new with VIX and try to use it for a proto infrastructure.

When I try to start a VM with VIX (from a VM of the same host) here is what I get :

vmrun -T esx -h https://bod-qa-vmhost1.vsg3d.intra/sdk -u root -p rootPassword start "[Local Datastore HDD1 VMs] bod-qa-vmbuild2/bod-qa-vmbuild2.vmx"

Unable to connect to host.

Error: This operation is not supported with the current license

I have a free license ESXi, is this the issue ?

What king of license should I need to make it run ?

Thanks.