Interesting.
That code sounds very simple, so it
probably is not the problem, unless it is a simple class name or usage error.
If you haven't already, check to make sure that all components involved have the latest firmware, and double check the Victor's ID in the RoboRIO Web Configuration Tool. Make sure that the ID listed there is the same that you are using in your code, and while you're at it, update the firmware.
Also, try the troubleshooting section on page 4/5 in
this pdf. Also, double check the electric wiring and make sure that the transmitter and receiver are powered to ON.
Good luck!