Lua error that I'm not sure how to fix. Need help!

[Mayron]

Hi, I have a script that is causing a Lua error message and I do not understand why it is wrong.

I have a button that should only show if a KgPanel frame is visible so I put this OnLoad script into it:

if kgPanels:FetchFrame("chatBox2"):IsVisible() then
self:Hide()
else
self:Show()
end

and the "chatBox2" frame has an OnLoad script "self:Hide() so the button should not show. However I get this error message when I log in or reload:

Message: [string "chatBox2ButtonExpand_OnLoad"]:4: attempt to index a nil value

Does anyone know what I'm doing wrong with this?

[SDPhantom]

Please post full error and code. From here, all I can say is either kgPanels, self, or the return from kgPanels:FetchFrame("chatBox2") is nil. Without all the info, there's no way to tell from here.

Note, full error posting will help us with stack trace info to see if it may be propagating from another function and locals info will display the current status of any locals in the current function. Full code posting is needed in case any of the locals may be corrupted through some error before the section you had supplied.

[Mayron]

Originally Posted by SDPhantom Please post full error and code. From here, all I can say is either kgPanels, self, or the return from kgPanels:FetchFrame("chatBox2") is nil. Without all the info, there's no way to tell from here. Note, full error posting will help us with stack trace info to see if it may be propagating from another function and locals info will display the current status of any locals in the current function. Full code posting is needed in case any of the locals may be corrupted through some error before the section you had supplied.

Sorry about that, here it is:

Message: [string "chatBox2ButtonExpand_OnLoad"]:4: attempt to index a nil value
Time: 11/05/12 18:35:44
Count: 1
Stack: [string "chatBox2ButtonExpand_OnLoad"]:4: in function `y'
Interface\AddOns\kgPanels\kgPanels.lua:1120: in function `SetupScript'
Interface\AddOns\kgPanels\kgPanels.lua:812: in function `InitScripts'
Interface\AddOns\kgPanels\kgPanels.lua:798: in function `PlaceFrame'
Interface\AddOns\kgPanels\kgPanels.lua:705: in function `ApplyLayout'
Interface\AddOns\kgPanels\kgPanels.lua:504: in function <Interface\AddOns\kgPanels\kgPanels.lua:500>
(tail call): ?
[C]: ?
[string "safecall Dispatcher[1]"]:9: in function <[string "safecall Dispatcher[1]"]:5>
(tail call): ?
...ace\AddOns\Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:543: in function `EnableAddon'
...ace\AddOns\Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:636: in function <...ace\AddOns\Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:621>
[C]: in function `LoadAddOn'
Interface\FrameXML\UIParent.lua:299: in function `UIParentLoadAddOn'
Interface\FrameXML\UIParent.lua:322: in function `CombatLog_LoadUI'
Interface\FrameXML\UIParent.lua:692: in function <Interface\FrameXML\UIParent.lua:657>

Locals: <none>

[SDPhantom]

I'm noticing you're loading from CombatLog_LoadUI(). Are you trying to access ChatFrame2? The code seems to be trying to access chatBox2. This is still only a guess. I don't use kgPanels and for those that are more capable, full code would help in trying to debug this problem.

[Mayron]

Sorry for the confusion but the chatBox2 is actually the KgPanel. I'm not trying to access the chat box but to access the panel which I use for the background of the chat frame.

EDIT: This is the full code:

I have one button (chatBox2ButtonExpand) to show the chatBox2 frame:

OnLoad:

if kgPanels:FetchFrame("chatBox2"):IsVisible() then
self:Hide()
else
self:Show()
end

OnUpdate:

if InCombatLockdown() then return end
if kgPanels:FetchFrame("chatBox2ButtonRetract"):IsVisible() then
self:Hide()
elseif IsAltKeyDown() and not IsControlKeyDown() and not IsShiftKeyDown() then
self:Show()
else
self:Hide()
end

OnClick:

local scripts = kgPanelsDB.global.layouts["MayronUI"]["chatBox2"].scripts
if pressed then
if InCombatLockdown() then return end
kgPanels:FetchFrame("chatBox2"):Show()
if scripts.LOAD:sub(-11,-7) == "self:" then
    if scripts.LOAD:sub(-6) == "Hide()" then
        scripts.LOAD = scripts.LOAD:sub(1,-12).."self:Show()"
    end
else
    scripts.LOAD = scripts.LOAD.."\nself:Show()"
end
kgPanels:FetchFrame("chatBox2ButtonRetract"):Show()
self:Hide()
end

the ChatBox2:
OnLoad:

self:Hide()

and the ChatBox2ButtonRetract (button to hide the chatBox2 frame):
OnLoad:

if kgPanels:FetchFrame("chatBox2"):IsVisible() then
self:Show()
else
self:Hide()
end

OnUpdate:

if InCombatLockdown() then return end
if kgPanels:FetchFrame("chatBox2"):IsVisible() then
if IsAltKeyDown() and not IsControlKeyDown() and not IsShiftKeyDown() then
self:Show()
else
self:Hide()
end
else
self:Hide()
end

OnClick:

local scripts = kgPanelsDB.global.layouts["MayronUI"]["chatBox2"].scripts
if pressed then
if InCombatLockdown() then return end
kgPanels:FetchFrame("chatBox2"):Hide()
if scripts.LOAD:sub(-11,-7) == "self:" then
    if scripts.LOAD:sub(-6) == "Show()" then
        scripts.LOAD = scripts.LOAD:sub(1,-12).."self:Hide()"
    end
else
    scripts.LOAD = scripts.LOAD.."\nself:Hide()"
end
kgPanels:FetchFrame("chatBox2ButtonExpand"):Show()
self:Hide()
end

_

[Phanx]

Based on the code and the error, my best guess would be that kgPanels is not passing "self" to your panel's OnLoad script, but it should be doing that, so I really have no idea.

[SDPhantom]

Assuming kgPanels is doing what it "should", I'd say it's not finding chatBox2. I'll have to tear apart the addon to trace where the error might be coming from. It may just be a configuration error, which is something that wouldn't show up in code or the stack trace. For all I can tell, it could come down to something as simple as incorrect case in the spelling of chatBox2.

My first step would be to run print(self) somewhere at the top of the script, which should return a table value. Other variables to check using this would be kgPanels and kgPanels:FetchFrame("chatBox2"). Both should be table values as well.

Notice we're not checking if FetchFrame() exists in kgPanels, this is because the error is describing indexing nil, not calling it.

PS: I think I looked at kgPanels' code before and noticed they add some lines to the beginning of some if not all scripts, so I wouldn't trust the line number to be accurate.