Irrlicht Engine

Hello,
I'm using your chatbox and :
error C2065: 'EGUIET_CHAT_BOX' : undeclared identifier

Can you help me ?

Can someone give a fix for this problem ? :
>Main.cpp
1>c:\dokumente und einstellungen\meep\desktop\test3d\application\client\main.cpp(50) : error C2259: 'irr::gui::CImageGUISkin' : cannot instantiate abstract class
1> due to following members:
1> 'void irr::gui::IGUISkin::draw3DTabButton(irr::gui ...

Hmm someone fixed this problem ? :S