Why do I get Error-2201​1 when I try to run a HW Watchdog Timer vi?

I am trying to use the HW watchdog timer vi's on the RT functions palette (Watchdog Configure.vi and Watchdog Clear.vi). Error-22011 is generated when Watchdog Open.vi is called (a subvi to Watchdog Configure.vi).
"Explain Error" gives this result:
"NI-Watchdog: The watchdog hardware you requested is already in use, or has been permanently locked."
I get this error every time I execute Watchdog Configure.vi even if the host computer and network controller have just been rebooted. There is no place to specify or lock/unlock the hardware (that I can find). I'm using Windows XP, LV8.5, and the FP2010 controller.
Thanks in advance for any help.
pmac

Yes, I have NI-Watchdog  2.1.5 installed on my FP.
In fact, I figured out what the Error-22011 problem was all about and I'm almost too embarrassed to say. I had Watchdog Configure.vi inside a while loop... so only the first iteration would be error free and for every iteration after that, the hardware would be "already in use". Hence, Error-22011.
I've made it over that hurdle, but I'm still having problems.
Now,I have both Watchdog Configure.vi and Watchdog Clear.vi outside the while loop and I put Watchdog Whack.vi inside the while loop (mainly to monitor the watchdog status output). I also wired the occurrence output of Watchdog Configure.vi to a second while loop in which there is a wait for occurrence.vi wired to a boolean indicator.
If I disconnect the ethernet cable while this vi is running, the program pauses and I get a Labview generated message informing me of a lost connection however, there is no occurrence generated and the watchdog stays in "running" status.
Apparently, I've misunderstood how to implement the watchdog vi's and I'll need someone to set me straight.
Is there anyone who can help?
Thanks,
pmac

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