FileNotFoundException with EventHandler and NetworkWatcherEventArgs

Can you help me determine why the application throws an exception? Is there other information I can provide? The application runs fine on the development PC, but not on the production PC. Thank you.

1. Exception text: System.IO.FileNotFoundException

2. Dev environment: Visual Studio 2010, C#, Windows 7 64-bit

3. Exception occurs when attempting to create event handlers:

                this.Found += new EventHandler<NetworkWatcherEventArgs>(robot_Found);

                this.Lost += new EventHandler<NetworkWatcherEventArgs>(robot_Lost);

4. Installed PCSDK on the destination PC

5. VS references:

6. If the event handler lines of code are removed, and nothing else within the code attempts to communicate with the robot, the application runs fine.