Derma Testing problems, attempt to call field 'create' (a nil value)

I’m just working on derma menus from the skeleton gamemode and I’m stuck with a problem where the tabs (DPropertySheet) don’t work properly and I get this error:


[gamemodes\skeleton\gamemode\cl_init.lua:28] attempt to call field 'create' (a nil value)

heres the cl_init.lua file:
[lua]include( ‘shared.lua’ )

// Clientside only stuff goes here
function ShowTeamMenu()
local DermaPanel = vgui.Create( “DFrame” ) – Creates the frame itself
DermaPanel:SetPos( 80,80 ) – Position on the players screen
DermaPanel:SetSize( 800, 600 ) – Size of the frame
DermaPanel:SetTitle( “Main Menu” ) – Title of the frame
DermaPanel:SetVisible( true )
DermaPanel:SetDraggable( false ) – Draggable by mouse?
DermaPanel:ShowCloseButton( true ) – Show the close button?
DermaPanel:MakePopup() – Show the frame

local TestingPanel = vgui.Create( “DPanel”, DermaPanel )
TestingPanel:SetPos( 25, 50 )
TestingPanel:SetSize( 750, 50 )
TestingPanel.Paint = function() – Paint function
surface.SetDrawColor( 50, 50, 50, 255 ) – Set our rect color below us; we do this so you can see items added to this panel
surface.DrawRect( 0, 0, TestingPanel:GetWide(), TestingPanel:GetTall() ) – Draw the rect
surface.DrawText( “Message of the Day: Zyler Rocks!” )

local PropertySheet = vgui.Create( “DPropertySheet” )
PropertySheet:SetParent( DermaPanel )
PropertySheet:SetPos( 25, 110 )
PropertySheet:SetSize( 750, 315 )

local Welcome = vgui.create( “DCheckBoxLabel” )
Welcome:SetText( “POOTISESPENSER HERE A” )

local Character = vgui.create( “DCheckBoxLabel” )
Character:SetText( “POOTISESPENSER HERE B” )

local Props = vgui.create( “DCheckBoxLabel” )
Props:SetText( “POOTISESPENSER HERE C” )

PropertySheet:AddSheet( “Welcome”, Welcome, “gui/silkicons/user”, false, false, “Rules and stuff” )
PropertySheet:AddSheet( “Character/Groups”, Character, “gui/silkicons/group”, false, false, “Manage your character and groups” )
PropertySheet:AddSheet( “Props/Tools”, Props, “gui/silkicons/group”, false, false, “Get Props and Tools” )

end
end

usermessage.Hook( “call_vgui”, ShowTeamMenu )
[/lua]

it looks like this:
http://img9.imageshack.us/img9/306/hl22011061320224937.png

Uploaded with ImageShack.us

The other files wouldn’t have anything of importance, the init lua just calls the usermessage to create the derma menu on initial player spawn.

Lua is case-sensitive; [lua]vgui.create[/lua] should be [lua]vgui.Create[/lua]

thanks