Win32 Application Programming C++, Error with parameter Type LPCWSTR

Question

I am constructing a program using the Win32 Application on Visual Studio 2013. From the tutorials I have read, I know this following code is correct, but I don\'t know where

Answer 1

LRESULT CALLBACK WinProc(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam){
switch (Message){   
case WM_PAINT:
    break;
case WM_CREATE:

    break;

case WM_DESTROY:

    return 0;

default:

    if (IsWindowUnicode(hWnd))
        return DefWindowProcW(hWnd, Message, wParam, lParam);
    else
        return DefWindowProcA(hWnd, Message, wParam, lParam);
    break;
}
return 0;}