Exception from HRESULT: 0xC00D0072 in Desktop Recorder

i downloaded this source code , i tried to run it but when i click start recording it crash ! , i wonder what make it crash and what to do to avoid any further error in this code?

DesktopEncoder.PrepareToEncode(true);

Instead of blindly running other peoples code, please read their whole article:

Prerequisites:

In order to use this application, we require Media Player Encoder 9.

He even gives a download link.

Edit:

The error code says:

0xC00D0072

NS_E_NO_SPECIFIED_DEVICE

"No specified device driver is present."

It seems you are missing something important.