Hello guys, well this is my problem

Every time I try to activate [GUI]Header & Background items

I Get a note saying:

[GUI] Background cannot be used ingame.

[GUI] Header cannot be used ingame.

and Under the note it says:

Activated: [GUI] Background

Activated: [GUI] Header

But it doesn't activate, I have done /dl yonas123 , but it still doesnt show

Please Help