[Dev-C++] Windows application

There is a problem with this windows application. I'm getting an invalid 
conversion from void* message at the marked line.

#include <windows.h>

long FAR PASCAL _export WndProc(HWND hwnd, UINT message, UINT wParam, LONG 
lParam)
{
  HDC hdc;
  HPEN hpen, hpenOld;
  PAINTSTRUCT ps;
  RECT rect;

  switch(message)
  {
    case WM_PAINT:
      hdc = BeginPaint(hwnd, &ps);
      GetClientRect(hwnd, &rect);
      hpen = CreatePen(PS_SOLID,6,RGB(0, 0, 255));
      hpenOld = (HPEN)SelectObject(hdc, hpen);
      Rectangle(hdc,               rect.left + 10,
         rect.top + 10,
         rect.right - 10,
         rect.bottom - 10);

      DrawText(hdc, "Hello, world!", -1, &rect,
         DT_SINGLELINE | DT_CENTER | DT_VCENTER);

     SelectObject(hdc, hpenOld);
     DeleteObject(hpen);
     EndPaint(hwnd, &ps);
     return 0;

   case WM_DESTROY:
         PostQuitMessage(0);
         return 0;
}
    return DefWindowProc(hwnd, message, wParam, lParam);
}

int PASCAL WinMain(HANDLE hInstance, HANDLE hPrevInstance, LPSTR 
lpszCmdParam,
                                   int nCmdShow)
{
       static char szAppName[] = "Hello";
       HWND hwnd;
       MSG msg;
       WNDCLASS wndclass;

       if(!hPrevInstance)
       {
           wndclass.style         = CS_HREDRAW | CS_VREDRAW;
           wndclass.lpfnWndProc   = WndProc;
           wndclass.cbClsExtra    = 0;
           wndclass.cbWndExtra    = 0;
           wndclass.hInstance     = hInstance;
           wndclass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
           wndclass.hCursor       = LoadCursor(NULL, IDC_ARROW);
           wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
           wndclass.lpszMenuName  = NULL;
           wndclass.lpszClassName = szAppName;

           RegisterClass(&wndclass);
       }

       hwnd = CreateWindow(szAppName,     //window class name
            "HELLO Program",              //windows caption
            WS_OVERLAPPEDWINDOW,          //window style
            CW_USEDEFAULT,                 //inital x position
            CW_USEDEFAULT,                 //inital y position
            CW_USEDEFAULT,                 //inital x size
            CW_USEDEFAULT,                 //inital y size
            NULL,                         //parent window handle
            NULL,                         //window menu handle
            hInstance,                    //program instance handle
            NULL);                        //creation paramaters   //invalid 
conversion from void

      ShowWindow(hwnd, nCmdShow);
      UpdateWindow(hwnd);

      while (GetMessage(&msg, NULL, 0, 0))
      {
          TranslateMessage(&msg);
          DispatchMessage(&msg);
      }
      return msg.wParam;

}

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