Hi, i suggest you file this bug to the support at national instrument.
However as a help, this means that either your server or device inside the server is not being registered correctly. One possibility is that the device name used has xml special characters in it.
One way to check it is to check the xml file that gets generated. You should find them in Program Files\National Instruments\Shared\DSC|VI Based Server\8.0\ directory. There should be 2 files, one is DSC Server.xml and if you open this you should see the server you just registered.
The other file is the server file itself, open this and see if you have malformed device name or property.
You could always attach the two XML files and the registration VI data for your server.