error LNK2019: unresolved external symbol "void * __cdecl Upp::MemoryAlloc(unsigned int)" (?MemoryAlloc@Upp@@YAPAXI@Z) referenced in function "void * __cdecl operator new(unsigned int)" (??2@YAPAXI@Z)
main.obj : error LNK2019: unresolved external symbol "void __cdecl Upp::MemoryFree(void *)" (?MemoryFree@Upp@@YAXPAX@Z) referenced in function "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
MSVCRT.lib(crtexe.obj) : error LNK2019: unresolved external symbol _main referenced in function__tmainCRTStartup

#include <CtrlLib/CtrlLib.h>

using namespace Upp;

    GUI_APP_MAIN{
     	PromptOK("Hello world");     
         
    }