can't change gamemod

Hello all i have a bug in my gmod i can change the gamemod do any one know how to fixe it???

Warning: vgui.Create failed to create the VGUI component (DMenuOption)
Lua: addons\derma\lua\vgui\dmenu.lua:84: attempt to index local ‘pnl’ (a nil value)

It was caused by the update most likely.

Fix: http://www.facepunch.com/showpost.php?p=23166919&postcount=3

Either that or wait for Garry to update again I suppose.