I am trying to add the grammar in my speech recognition code in Windows SAPI using COM. While loading the grammar file using LoadCmdFromFile function it is getting failed even though I did exactly what windows sample code has done.

hr = cpEngine->CreateRecoContext(&cpRecoCtx);
hr = cpRecoCtx->CreateGrammar(1, &cpRecoGrammar);
if(FAILED(hr)){
        MessageBox(hwnd, TEXT("CreateGrammar failed"), TEXT("error"), MB_OK);
        DestroyWindow(hwnd);
}

 hr = cpRecoGrammar->LoadCmdFromFile(L"email.xml", SPLO_DYNAMIC);
 if(FAILED(hr)){
        MessageBox(hwnd, TEXT("LoadCmdFromFile failed"), TEXT("error"), MB_OK);
        DestroyWindow(hwnd);
}

After execution it logs the LoadCmdFromFile failed. Please help to resolve this.