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why does my xen hypervisor show 0 vcpus from domu?

I'm using the easy install script (https://wiki.openstack.org/wiki/XenServer/DevStack) but when I try to fire up a VM I get a "Error: No valid host was found." My best guess as to why that's happening is that when I look at the hypervisor screen I see "VCPU Usage Used 1 of 0". My machine has 4 cores and I configured the DomU to only use 1 (in an effort to troubleshoot this).

I've been forward and back through the instructions but I'm lost as to what I might have missed...