Unable to Create a Modal DialogBox in SDK

When I try to create a modal dialog box using DialogBox() macro, I get an error 1402 (Class not found). I created the DialogBox in resource editor and included the resource.h

My source:

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#include "resource.h"

HWND hDlg;
BOOL CALLBACK fnStatDlg(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{

     HWND hWndOwner = GetDesktopWindow();
     int iVal=DialogBox(hInstance, MAKEINTRESOURCE(IDD_MAIN), NULL, (DLGPROC)fnStatDlg);
     int iErr=GetLastError();
     return 0;
}

BOOL CALLBACK fnStatDlg(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
     switch(uMsg)
     {
     case WM_INITDIALOG:
          return true;
     
     case WM_CLOSE:
          EndDialog(hDlg,0);
          return 0;
     }
     return false;
}