LUA Error Help

Guides UI and Macro
1

Hello community, I am having an issue on the classic anniversary realms with this LUA error that is frequently plaguing me:

Message: …PanelManager/Classic/UIParentPanelManager_Shared.lua:1035: attempt to call global ‘FCF_DockUpdate’ (a nil value)
Time: Thu Apr 3 20:52:51 2025
Count: 1
Stack: …PanelManager/Classic/UIParentPanelManager_Shared.lua:1035: attempt to call global ‘FCF_DockUpdate’ (a nil value)
[string “@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua”]:1035: in function UIParentManageFramePositions' [string "@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua"]:325: in function <...PanelManager/Classic/UIParentPanelManager_Shared.lua:312> [string "=[C]"]: in function SetAttribute’
[string “@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua”]:1045: in function UIParent_ManageFramePositions' [string "@Interface/AddOns/Blizzard_ActionBar/Classic/PetActionBarFrame.lua"]:37: in function <...Ons/Blizzard_ActionBar/Classic/PetActionBarFrame.lua:36> [string "=[C]"]: in function Show’
[string “@Interface/AddOns/Blizzard_ActionBar/Classic/PetActionBarFrame.lua”]:279: in function `ShowPetActionBar’
[string “@Interface/AddOns/Blizzard_ActionBar/Classic/PetActionBarFrame.lua”]:74: in function <…Ons/Blizzard_ActionBar/Classic/PetActionBarFrame.lua:55>

Locals: self = Frame {
}
yOffsetFrames =

{
1 = “pet”
}
xOffsetFrames =
{
}
hasBottomLeft = nil
hasBottomRight = nil
hasPetBar = 1
anchorY = 0
buffsAnchorY = 0
rightActionBars = 0
numBossFrames = 0
(*temporary) = nil
(*temporary) = “attempt to call global ‘FCF_DockUpdate’ (a nil value)”
UIPARENT_VARIABLE_OFFSETS =
{
rightActionBarsX = 140.999954
}

Message: …PanelManager/Classic/UIParentPanelManager_Shared.lua:1035: attempt to call global ‘FCF_DockUpdate’ (a nil value)
Time: Thu Apr 3 20:52:51 2025
Count: 1
Stack: …PanelManager/Classic/UIParentPanelManager_Shared.lua:1035: attempt to call global ‘FCF_DockUpdate’ (a nil value)
[string “@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua”]:1035: in function UIParentManageFramePositions' [string "@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua"]:325: in function <...PanelManager/Classic/UIParentPanelManager_Shared.lua:312> [string "=[C]"]: in function SetAttribute’
[string “@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua”]:1045: in function UIParent_ManageFramePositions' [string "@Interface/AddOns/Blizzard_ActionBar/Classic/PetActionBarFrame.lua"]:286: in function ShowPetActionBar’
[string “@Interface/AddOns/Blizzard_ActionBar/Classic/PetActionBarFrame.lua”]:74: in function <…Ons/Blizzard_ActionBar/Classic/PetActionBarFrame.lua:55>

Locals: self = Frame {
}
yOffsetFrames =

{
1 = “pet”
}
xOffsetFrames =
{
}
hasBottomLeft = nil
hasBottomRight = nil
hasPetBar = 1
anchorY = 0
buffsAnchorY = 0
rightActionBars = 0
numBossFrames = 0
(*temporary) = nil
(*temporary) = “attempt to call global ‘FCF_DockUpdate’ (a nil value)”
UIPARENT_VARIABLE_OFFSETS =
{
rightActionBarsX = 140.999954
}

Message: …PanelManager/Classic/UIParentPanelManager_Shared.lua:1035: attempt to call global ‘FCF_DockUpdate’ (a nil value)
Time: Thu Apr 3 20:52:51 2025
Count: 1
Stack: …PanelManager/Classic/UIParentPanelManager_Shared.lua:1035: attempt to call global ‘FCF_DockUpdate’ (a nil value)
[string “@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua”]:1035: in function UIParentManageFramePositions' [string "@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua"]:325: in function <...PanelManager/Classic/UIParentPanelManager_Shared.lua:312> [string "=[C]"]: in function SetAttribute’
[string “@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua”]:1045: in function `UIParent_ManageFramePositions’
[string “@Interface/AddOns/Blizzard_ActionBar/Classic/PetActionBarFrame.lua”]:37: in function <…Ons/Blizzard_ActionBar/Classic/PetActionBarFrame.lua:36>

Locals: self = Frame {
}
yOffsetFrames =

{
1 = “pet”
}
xOffsetFrames =
{
}
hasBottomLeft = nil
hasBottomRight = nil
hasPetBar = 1
anchorY = 0
buffsAnchorY = 0
rightActionBars = 0
numBossFrames = 0
(*temporary) = nil
(*temporary) = “attempt to call global ‘FCF_DockUpdate’ (a nil value)”
UIPARENT_VARIABLE_OFFSETS =
{
rightActionBarsX = 140.999954
}

This error occurs whenever I enable an addon and /reload. If I load the game without any addons enabled it does not show up.

Thanks!

2

I see we have relocated!

1 Like
3

Looks like whatever FCF addon you have installed.

4

FCF_DockUpdate doesnt have a value assigned to it, its looking for the pet action bars but without going through the code thats as far as my paygrade will allow

5

This would indicate that an addon is redefining that function as nil (or assigning it to a function that does not exist possibly due to some form of version checking).

Search your addon code for FCF_DockUpdate and see what you get.

6

Thank you for replying, can you please explain what “fcf” means or how I go about searching for that?

7

FCF stands for Floating Chat Frame which is part of the game (Blizzard’s) chat system that deals with that actual configuration of the chat frames.

NotePad+ is a common text editor that allows you to do file/folder searches.

Alternatively (especially if the error occurs on or soon after logging into a character) you could move addons out of the AddOns folder in batches then play the game until the error goes away. Once that happens, return addons one-at-a-time from the last batch until it comes back which will give you the offending addon.

8

Error only occurs when I have a pet out (playing a hunter) and only on /reload - tried with zero addons enabled and still the same result - whenever I have an active pet the error appears.

9

The error might be explained if you were running classic 1.15.6 UI code on the current classic 1.15.7 client.

The current version shouldn’t have a UIParentPanelManager_Shared.lua file.

The 1.15.7 UIParentPanelManager.lua file has

	-- Update chat dock since the dock could have moved
	if ( FCF_DockUpdate ) then
		FCF_DockUpdate();
	end

to check if FCF_DockUpdate exists.

You could run

/run local version =  GetBuildInfo() print("Version:", version)

Both after logging in and /reload. It should print Version: 1.15.7.

1 Like
10

It does print that exact version pre and post /reload - I don’t know if this recent patch / maintenance did anything but the problem seems to be resolved - thank you for all the assistance! Best of luck in Azeroth!

11

Maybe 1.15.7 was the latest maintenance update…

12

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