Derma error when i call GetValue() on my slider

[Bennocs]

Hi, i'm working on a character creation screen, but i'm having some problems getting the value of my slider.
The function i'm using right now is:
[lua]
results.age = age.GetValue()
[/lua]([i]This is on line [b]225[/b] in the code[/i])

But it comes up with this error:

vgui/DNumSlider.lua:67: attempt to index local 'self' (a nil value)

How do i retrieve the value of my slider?

[b]Another question[/b]:
I use this function, when wanna retrieve the info from my DMultiChoice-menu:
[lua]
surname.OnSelect = function(index,value,data)
surnameOption = data
end
[/lua]([i]This is on line [b]79[/b] in the code[/i])

Later on i just read the "surnameOption" variable.
Isn't there a function like Getvalue() to use instead?

[b]Source Code[/b]
Source code can be found here:
[url]http://pastebay.com/75526[/url]
and here:
[lua]
function namepicker(ply, cmd, args)
local width = 500
local height = 500
local padding = 10

local dermaPanel = vgui.Create("DFrame")
dermaPanel:SetPos(ScrW() - width - 50,(ScrH() / 2 - height / 2))
dermaPanel:SetSize(width, height)
dermaPanel:SetTitle("Please customize your character")
dermaPanel:SetVisible(true)
dermaPanel:SetDraggable(false)
dermaPanel:ShowCloseButton(true)
dermaPanel:MakePopup()

local propertySheet = vgui.Create("DPropertySheet", dermaPanel)
propertySheet:SetPos(padding, 20 + padding)
propertySheet:SetSize(width - padding * 2, height - 20 - padding * 2)

/* THIS IS THE INTRO SCREEN! */
local introScreen = vgui.Create("DPanelList", dermaPanel)
introScreen:SetPos(padding,20 + padding)
introScreen:SetSize(width - padding * 2, height - 20 - padding * 2)
introScreen:SetSpacing(5) -- Spacing between items
introScreen:EnableHorizontal(false) -- Only vertical items
introScreen:EnableVerticalScrollbar(true) -- Allow scrollbar if you exceed the Y axis

local info = vgui.Create("DLabel", introScreen)
info:SetPos(padding,padding)
info:SetText([[
Welcome to the server. You need to create your character before joining.
Choose with care. You can't change the name and age later on.

To start: go to the next tab in this menu.
]])
info:SizeToContents()

/* THIS IS THE INFO SCREEN*/
local infoScreen = vgui.Create("DPanelList", dermaPanel)
infoScreen:SetPos(padding,20 + padding)
infoScreen:SetSize(width - padding * 2, height - 20 - padding * 2)
infoScreen:SetSpacing(5) -- Spacing between items
infoScreen:EnableHorizontal(false) -- Only vertical items
infoScreen:EnableVerticalScrollbar(true) -- Allow scrollbar if you exceed the Y axis

local firstnameLabel = vgui.Create("DLabel", infoScreen)
firstnameLabel:SetPos(padding,padding)
firstnameLabel:SetText("Please select a firstname: ")
firstnameLabel:SizeToContents()

local firstname = vgui.Create("DTextEntry", infoScreen)
firstname:SetPos(150,padding)
firstname:SetTall(20)
firstname:SetWide(310)
firstname:SetEnterAllowed(true)

local surnameLabel = vgui.Create("DLabel", infoScreen)
surnameLabel:SetPos(padding,padding + 30)
surnameLabel:SetText("Please select a surname: ")
surnameLabel:SizeToContents()

local surname = vgui.Create("DMultiChoice", infoScreen)
surname:SetPos(150, padding + 30)
surname:SetSize(310, 20)
surname:SetEditable(false)

surnameOption = ""

local surnames = {
"svendsen",
"johansen",
"eriksen",
"iversen",
"jakobsen"
}
for k,v in pairs(surnames) do
surname:AddChoice(v) -- Add our options
end

surname.OnSelect = function(index,value,data)
surnameOption = data
end

local ageLabel = vgui.Create("DLabel", infoScreen)
ageLabel:SetPos(padding,padding + 75)
ageLabel:SetText("Age of your character: ")
ageLabel:SizeToContents()

local age = vgui.Create("DNumSlider", infoScreen)
age:SetPos(150,padding + 60)
age:SetSize(310, 250)
age:SetText("Age of your character")
age:SetMin(15)
age:SetMax(50)
age:SetDecimals(0)

/* THE PLAYERMODEL SCREEN */
local modelScreen = vgui.Create("DPanelList", dermaPanel)
modelScreen:SetPos(padding,20 + padding)
modelScreen:SetSize(width - padding * 2, height - 20 - padding * 2)
modelScreen:SetSpacing(5) -- Spacing between items
modelScreen:EnableHorizontal(false) -- Only vertical items
modelScreen:EnableVerticalScrollbar(true) -- Allow scrollbar if you exceed the Y axis

local genderSheet = vgui.Create("DPropertySheet", modelScreen)
genderSheet:SetPos(2, 2)
genderSheet:SetSize(466, 426)

local maleScreen = vgui.Create("DPanelList", modelScreen)
maleScreen:EnableVerticalScrollbar(true)
maleScreen:EnableHorizontal(true)
maleScreen:SetPadding(0)
maleScreen:SetPos(padding,padding)
maleScreen:SetSize(width - 50, height - 90)

local femaleScreen = vgui.Create("DPanelList", modelScreen)
femaleScreen:EnableVerticalScrollbar(true)
femaleScreen:EnableHorizontal(true)
femaleScreen:SetPadding(0)
femaleScreen:SetPos(padding,padding)
femaleScreen:SetSize(width - 50, height - 90)

local malemodels = {
"models/player/Group01/male_07.mdl",
"models/player/Group01/Male_01.mdl",
"models/player/Hostage/Hostage_01.mdl",
"models/player/Hostage/Hostage_04.mdl",
"models/player/Group01/male_07.mdl",
"models/player/Group01/Male_01.mdl",
"models/player/Hostage/Hostage_01.mdl",
"models/player/Hostage/Hostage_04.mdl"
}
local femalemodels = {
"models/player/Group01/Female_01.mdl",
"models/player/Group01/Female_07.mdl",
"models/player/Group01/Female_01.mdl",
"models/player/Group01/Female_07.mdl"
}

playermodel = ""

for k,v in pairs(malemodels) do
local icon = vgui.Create("SpawnIcon", maleScreen)
icon:SetModel(v)
maleScreen:AddItem(icon)
icon.DoClick = function(icon)
playermodel = v
LocalPlayer():EmitSound("click.wav")
end
end
for k,v in pairs(femalemodels) do
local icon = vgui.Create("SpawnIcon", maleScreen)
icon:SetModel(v)
femaleScreen:AddItem(icon)
icon.DoClick = function(icon)
playermodel = v
LocalPlayer():EmitSound("click.wav")
end
end

genderSheet:AddSheet("Male", maleScreen, "gui/silkicons/group", false, false, "All the male playermodels goes in here")
genderSheet:AddSheet("Female", femaleScreen, "gui/silkicons/group", false, false, "All the female playermodels goes in here")

/* THE KEYBINDSSCREEN*/
local bindsScreen = vgui.Create("DPanelList", dermaPanel)
bindsScreen:SetPos(padding,20 + padding)
bindsScreen:SetSize(width - padding * 2, height - 20 - padding * 2)
bindsScreen:SetSpacing(5) -- Spacing between items
bindsScreen:EnableHorizontal(false) -- Only vertical items
bindsScreen:EnableVerticalScrollbar(true) -- Allow scrollbar if you exceed the Y axis

local bindsinfo = vgui.Create("DLabel", bindsScreen)
bindsinfo:SetPos(padding,padding)
bindsinfo:SetText([[
Instead of using the standard keybinds, you can use your own. Just bind these console
commands to 2 different keys. If you just wanna use the normal binds, ignore this message.
]])
bindsinfo:SizeToContents()

local commandInfo = vgui.Create("DCollapsibleCategory", bindsScreen)
commandInfo:SetPos(padding,60 + padding )
commandInfo:SetSize(450, 50)
commandInfo:SetExpanded(0) -- Expanded when popped up
commandInfo:SetPadding(5)
commandInfo:SetLabel("Commands, click to view")

local commandinfoWrap = vgui.Create("DPanelList", commandInfo)
commandinfoWrap:SetPos(5,25)
commandinfoWrap:SetSize(440, 100)
commandinfoWrap:SetSpacing(5) -- Spacing between items
commandinfoWrap:EnableHorizontal(true) -- Only vertical items
commandinfoWrap:EnableVerticalScrollbar(true) -- Allow scrollbar if you exceed the Y axis

local commands = vgui.Create("DLabel", commandinfoWrap)
commands:SetPos(padding,padding)
commands:SetText([[
bind <key> rp_menu
bind <key> rp_doormenu+
]])
commands:SizeToContents()

commandInfo:SetContents(commandinfoWrap) -- Add our list above us as the contents of the collapsible category
/* THE GOSCREEN */
local finishScreen = vgui.Create("DPanelList", dermaPanel)
finishScreen:SetPos(padding,20 + padding)
finishScreen:SetSize(width - padding * 2, height - 20 - padding * 2)
finishScreen:SetSpacing(5) -- Spacing between items
finishScreen:EnableHorizontal(false) -

[NullPoint]

[lua]age:GetValue()[/lua]
not
[lua]age.GetValue()[/lua]

[editline]02:37PM[/editline]

About your second question, I think that the way you are doing it at the moment is the only way (not sure though).

[Bennocs]

Ok thanks :D
I just found a small typo, in my if-statement and change the "." to ":". Now it works perfectly. Thanks! :D

[NullPoint]

In fact, you could set the ConVar that the DMultiChoice changes when a choice is selected, then read the [url=http://wiki.garrysmod.com/?title=ConVar]convar[/url].

Look [url=http://wiki.garrysmod.com/?title=DMultiChoice.SetConVar]here[/url].

[Bennocs]

Ok, thanks :-)