Device manger error code 7

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Windows

audio

Hi,
In windows DDK'S MSVAD virtual audio driver, in IDMAChannel:copyto function I added the code for writing the audio data to WTS virtual channel. After the installation of driver the device is listing in the device manager with error code 7 (Filtering Failed - Possible problem in Device Driver Code) and a new speaker is not getting added for MSVAD driver in volume control.

Here is the code.

STDMETHODIMP_(void)
CMiniportWaveCyclicStreamMSVAD::CopyTo
(
    IN  PVOID                   Destination,
    IN  PVOID                   Source,
    IN  ULONG                   ByteCount

)
{
    ULONG BytesWritten;
    BOOL bWritten1;
    UNREFERENCED_PARAMETER(Destination);
    UNREFERENCED_PARAMETER(Source);
    UNREFERENCED_PARAMETER(ByteCount);
 
  
   HANDLE m_handle = WTSVirtualChannelOpen(WTS_CURRENT_SERVER_HANDLE,          WTS_CURRENT_SESSION, "Remote");
 bWritten1 = WTSVirtualChannelWrite(m_handle,reinterpret_cast<pchar>(Source),  ByteCount, &BytesWritten);

} // CopyTo
</pchar>

If I remove the code for WTS virtual channel, device is listing in device manager without warning. In volume control also a new speaker is added.

Can anybody suggest me why virtual audio driver is not functioning if I use WTSVirtualchannel APIs and how to resolve it....

Thanks a lot.