problem when CMdaAudioRecorderUtility->SetDestinationFormatL() is used

Hi
Greetings

I need to record to a file in raw format, Using SetDestinationFormatL() i am setting the foprmat to raw type,
but it is giving the error as " Feature Not supported " The code is given below
void CRecorderAdapter::RecordL()
    {
    // Record from the device microphone
    iMdaAudioRecorderUtility->SetAudioDeviceMode(CMdaAudioRecorderUtility::ELocal);

    // Set maximum gain for recording
    iMdaAudioRecorderUtility->SetGain(iMdaAudioRecorderUtility->MaxGain());
   
    // Delete current audio sample from beginning of file
    iMdaAudioRecorderUtility->SetPosition(TTimeIntervalMicroSeconds(0));
    iMdaAudioRecorderUtility->CropL();

    TMdaRawAudioClipFormat *iClipFormat = new (ELeave) TMdaRawAudioClipFormat;
    iMdaAudioRecorderUtility->SetDestinationFormatL(iClipFormat->Uid());

    iMdaAudioRecorderUtility->RecordL();
    }


Thanks in advance