Raptor - Change Debug Interface

Hi Admin.
i have a Raptor board . Now i was trying some sample code from USBCLient Example 2 Keyboard
https://www.ghielectronics.com/docs/20/usb-client

But the following exception is raised…
Program Started
#### Exception System.InvalidOperationException - CLR_E_INVALID_OPERATION (1) ####
#### Message:
#### GHI.Premium.USBClient.USBClientController::Init [IP: 0000] ####
#### GHI.Premium.USBClient.USBClientController::Start [IP: 0104] ####
#### GHI.Premium.USBClient.USBClientController+StandardDevices::StartMouse [IP: 0029] ####
#### GadgeteerApp3.Program::CheckUSBClient [IP: 0004] ####
#### GadgeteerApp3.Program::ProgramStarted [IP: 000c] ####
A first chance exception of type ‘System.InvalidOperationException’ occurred in GHI.Premium.USBClient.dll
An unhandled exception of type ‘System.InvalidOperationException’ occurred in GHI.Premium.USBClient.dll

Do we need to change DebugInterface? If yes how on Raptor board? ANy code sample…