I just installed Ultimate++ library and i have linked the source folder from the Project Options (in VS++) and when i compile the project, i get these errors:

(I am using Visual Studio 2012)

1>main.obj : error LNK2019: unresolved external symbol "void __cdecl Upp::AssertFailed(char const *,int,char const *)" (?AssertFailed@Upp@@YAXPBDH0@Z) referenced in function "protected: void __thiscall Upp::WString0::Zero(void)" (?Zero@WString0@Upp@@IAEXXZ)
1>main.obj : 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)
1>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)
1>main.obj : error LNK2019: unresolved external symbol "private: void __thiscall Upp::String0::LFree(void)" (?LFree@String0@Upp@@AAEXXZ) referenced in function "protected: void __thiscall Upp::String0::Free(void)" (?Free@String0@Upp@@IAEXXZ)
1>main.obj : error LNK2019: unresolved external symbol "protected: void __thiscall Upp::String0::Set(char const *,int)" (?Set@String0@Upp@@IAEXPBDH@Z) referenced in function "public: __thiscall Upp::String::String(char const *)" (??0String@Upp@@QAE@PBD@Z)
1>main.obj : error LNK2019: unresolved external symbol "private: void __thiscall Upp::WString0::Dsyn(void)" (?Dsyn@WString0@Upp@@AAEXXZ) referenced in function "protected: void __thiscall Upp::WString0::Zero(void)" (?Zero@WString0@Upp@@IAEXXZ)
1>main.obj : error LNK2019: unresolved external symbol "protected: void __thiscall Upp::WString0::Set(class Upp::WString0 const &)" (?Set@WString0@Upp@@IAEXABV12@@Z) referenced in function "public: __thiscall Upp::WString::WString(class Upp::WString const &)" (??0WString@Upp@@QAE@ABV01@@Z)
1>main.obj : error LNK2019: unresolved external symbol "protected: void __thiscall Upp::WString0::Free(void)" (?Free@WString0@Upp@@IAEXXZ) referenced in function "public: __thiscall Upp::WString0::~WString0(void)" (??1WString0@Upp@@QAE@XZ)
1>main.obj : error LNK2019: unresolved external symbol "void __cdecl Upp::BreakWhenPicked(void *)" (?BreakWhenPicked@Upp@@YAXPAX@Z) referenced in function "private: static class Upp::Vector<class Upp::WString> & __cdecl Upp::Vector<class Upp::WString>::SetPicked(class Upp::Vector<class Upp::WString> &)" (?SetPicked@?$Vector@VWString@Upp@@@Upp@@CAAAV12@AAV12@@Z)
1>main.obj : error LNK2019: unresolved external symbol "class Upp::String __cdecl Upp::FromSystemCharset(class Upp::String const &)" (?FromSystemCharset@Upp@@YA?AVString@1@ABV21@@Z) referenced in function _WinMain@16
1>main.obj : error LNK2019: unresolved external symbol "int __cdecl Upp::GetExitCode(void)" (?GetExitCode@Upp@@YAHXZ) referenced in function _WinMain@16
1>main.obj : error LNK2019: unresolved external symbol "void __cdecl Upp::AppExit__(void)" (?AppExit__@Upp@@YAXXZ) referenced in function _WinMain@16
1>main.obj : error LNK2019: unresolved external symbol "void __cdecl Upp::AppExecute__(void (__cdecl*)(void))" (?AppExecute__@Upp@@YAXP6AXXZ@Z) referenced in function _WinMain@16
1>main.obj : error LNK2019: unresolved external symbol "void __cdecl Upp::AppInitEnvironment__(void)" (?AppInitEnvironment__@Upp@@YAXXZ) referenced in function _WinMain@16
1>main.obj : error LNK2019: unresolved external symbol "public: static void __cdecl Upp::Ctrl::InitWin32(struct HINSTANCE__ *)" (?InitWin32@Ctrl@Upp@@SAXPAUHINSTANCE__@@@Z) referenced in function _WinMain@16
1>main.obj : error LNK2019: unresolved external symbol "public: static void __cdecl Upp::Ctrl::ExitWin32(void)" (?ExitWin32@Ctrl@Upp@@SAXXZ) referenced in function _WinMain@16
1>main.obj : error LNK2019: unresolved external symbol "public: static void __cdecl Upp::Ctrl::CloseTopCtrls(void)" (?CloseTopCtrls@Ctrl@Upp@@SAXXZ) referenced in function _WinMain@16
1>main.obj : error LNK2019: unresolved external symbol "class Upp::Vector<class Upp::WString> & __cdecl Upp::coreCmdLine__(void)" (?coreCmdLine__@Upp@@YAAAV?$Vector@VWString@Upp@@@1@XZ) referenced in function _WinMain@16
1>main.obj : error LNK2019: unresolved external symbol "class Upp::Vector<class Upp::WString> __cdecl Upp::SplitCmdLine__(char const *)" (?SplitCmdLine__@Upp@@YA?AV?$Vector@VWString@Upp@@@1@PBD@Z) referenced in function _WinMain@16
1>main.obj : error LNK2019: unresolved external symbol "void __cdecl Upp::PromptOK(char const *)" (?PromptOK@Upp@@YAXPBD@Z) referenced in function "void __cdecl GuiMainFn_(void)" (?GuiMainFn_@@YAXXZ)
1>c:\users\Guest\documents\visual studio 2012\Projects\Project1\Debug\Project1.exe : fatal error LNK1120: 20 unresolved externals

#include <CtrlLib/CtrlLib.h>
 
using namespace Upp;
 
GUI_APP_MAIN {
    PromptOK("Hello world");
}