CoCreateInstance Returning E_INVALIDARG

我在这里尝试做的只是创建一个接口的实例。真的应该这么简单。一直在关注任何在线材料，阅读我能找到的材料，但我一生都无法解决这个问题。

归根结底，CoCreateInstance返回的HRESULT为E_INVALIDARG。我已经尽可能地改变了参数，试图让它发挥作用，但仍然无法实现。所以请看一眼，希望有人能指出一些我看得太多的简单事情。

//Instantiate the sink class and hold a pointer to it.
    m_pSink = new CSink();
    HRESULT hr = CoInitialize(NULL);
    //Get a pointer to sinks IUnknown, no AddRef. CMySink implements only
    //dispinterface and the IUnknown and IDispatch pointers will be same.
    LPUNKNOWN pUnkSink = m_pSink->GetIDispatch(FALSE); 
    CLSID clsidInterface;
    hr = CLSIDFromProgID(L"Automation.AutomationInterface", &clsidInterface);
    ICALib::IAutomationInterface *p_Interface = NULL;
    hr = CoCreateInstance(clsidInterface, NULL, CLSCTX_LOCAL_SERVER, ICALib::IID_IAutomationInterface, (void**)p_Interface);
    if (hr != S_OK) // Show a message box if the Instance of the interface is not created and do not create the object.
    {
        CMessageBox(CMessageBox::WARNING_OK).Show(IDS_WARNING_BADLICENSE);
        m_failedToCreate = TRUE;
        this->~CMainClass();
        return;
    }
    //Establish a connection between source and sink.
    //m_pUnkSrc is IUnknown of server obtained by CoCreateInstance().
    //m_dwCookie is a cookie identifying the connection, and is needed to terminate the connection.
    BOOL result = AfxConnectionAdvise(p_Interface, m_pSink->GetGUID(), pUnkSink, FALSE, &m_dwCookie);

（由于法律责任，实际名称未显示在此代码中）