help, build a basic code project failed

Not using 2k13 , i`m on 2k15 ;d.
that is what i get when i compile in visual studio ,

and i get this when i compile in unreal :
CompilerResultsLog:Error: Error Door2.cpp.obj : error LNK2019: unresolved external symbol “private: static class UClass * __cdecl UDoor2::GetPrivateStaticClass(wchar_t const *)” (?GetPrivateStaticClass@UDoor2@@CAPEAVUClass@@PEB_W@Z) referenced in function “public: static void * __cdecl UDoor2::operator new(unsigned __int64,class UObject *,class FName,enum EO
bjectFlags)” (??2UDoor2@@SAPEAX_KPEAVUObject@@VFName@@W4EObjectFlags@@@Z)
CompilerResultsLog:Error: Error Door2.cpp.obj : error LNK2019: unresolved external symbol “public: __cdecl UDoor2::UDoor2(class FVTableHelper &)” (??0UDoor2@@QEAA@AEAVFVTableHelper@@@Z) referenced in function “public: static class UObject * __cdecl UDoor2::__VTableCtorCaller(class FVTableHelper &)” (?__VTableCtorCaller@UDoor2@@SAPEAVUObject@@AEAVFVTableHelpe
r@@@Z)
CompilerResultsLog:Error: Error D:\Unreal Projects\03_BuildingEscape\BuildingEscape\Binaries\Win64\UE4Editor-BuildingEscape-8211.dll : fatal error LNK1120: 2 unresolved externals