[C++] Errore per classe base non definita

[cadue]

Scusami, ecco:

#pragma comment(lib, "newton.lib")
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include "Application.h"

INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT )
{
 
    Application app;

        app.go();
    return 0;
}