That error means that some object is unexpectedly missing. The problem is that it does not say which object is missing. If there is a problem with your device then there could be an error earlier on that is preventing VC from creating the object which allows us to talk to the UUIRT. You can send me a log if you like.
But I think it makes more sense to first establish whether or not your UUIRT is working. Since it was fine last week with VC it probably means that VC is not to blame, but you never know.
You should try using something like the attached program to see if the device is OK. If it is not working with the program provided by the folks who made the device, then maybe they can help you, or would be willing to send you a new one if it was defective. If you only tell them it is not working with VoxCommando then they will just assume it is the fault of VC which they have probably never heard of.
If it works fine with other programs, then we can investigate further to see if there is something I can change in VC, but it is unlikely since many users including myself have tested the plugin for a while now with no major problems that I know of.