[ERROR] Code Help

[[-DG-] UnknownFoden™]

I keep getting this code, how do i fix it?

[ERROR] lua/vgui/dbutton.lua:91: attempt to index field 'Button' (a nil value)
  1. UpdateColours - lua/vgui/dbutton.lua:91
   2. ApplySchemeSettings - lua/vgui/dlabel.lua:78
    3. PerformLayout - lua/vgui/dlabel.lua:94
     4. unknown - lua/vgui/dbutton.lua:113

[Bytewave]

Verify your game/server files? That looks more like a corrupted core file if anything.

[Stickly Man!]

It's very likely that you picked a Derma skin for XGUI that caused all these issues. I still need to investigate what's causing this to happen... For now, try my steps outlined in this post and see if it helps you:
http://forums.ulyssesmod.net/index.php/topic,9330.msg47696.html#msg47696