[Walkerbo]

Hi all

Since the 9.0 launch, my addon no longer displays the Swarm interface category frame.
The addon continues to work without a problem but the player can no longer change options.

I do get the folowing lua error caught by bugsack;
1x Swarm\Swarm-SR 2.9.9.0.lua:357: attempt to call method 'SetBackdrop' (a nil value)
[string "@Swarm\Swarm-SR 2.9.9.0.lua"]:357: in main chunk

I have searched everywhere yet have not been able to find any reason that my interface category frame no longer displays; I tested my addons yesterday before 9.0 launched and can confirm that they were working without issue.

Here is my chunk;

local SwarmInterfaceFrame = CreateFrame("Frame", "SwarmInterfaceFrame", UIParent)
SwarmInterfaceFrame.name = "Swarm"
SwarmInterfaceFrame:SetBackdrop( -- line 357
    {
        bgFile = "Interface\\Buttons\\WHITE8X8",
        insets = {
            left = NumberDimensionList.insetSize,
            right = NumberDimensionList.insetSize,
            top = NumberDimensionList.insetSize,
            bottom = NumberDimensionList.insetSize
        },
        tileSize = nil,
        tile = false,
        edgeFile = "Interface\\Tooltips\\UI-Tooltip-Border",
        edgeSize = NumberDimensionList.edgeSize
    }
)
SwarmInterfaceFrame:SetBackdropColor(unpack(TextDimensionList.colourBackdrop))
SwarmInterfaceFrame:SetScript(
    "OnEvent",
    function(self, event, ...)
        if event == "PLAYER_LOGIN" then -- fires when a player logs in or reloads
            print(TextDimensionList.colourTextNPC .. " *** " .. addonName .. " - " .. versionNumber .. " Loaded *** \n") -- Load Message
            swarmSelfPlayerGUID = UnitGUID("player")
            initialiseVariables()
            updateScrollTargetList()
            togglePause()
            togglePower()
            SwarmMagicButton:Hide()
        elseif event == "PLAYER_ENTERING_WORLD" then -- fires when the player sees a loading screen
            SwarmMagicButton:Hide()
        elseif event == "PLAYER_TARGET_CHANGED" then -- fires when player target changes
            SwarmMagicButton:Hide()
            if UnitExists("target") and not UnitIsDead("target") then -- must have an alive target
                if UnitIsUnit("target", "player") and SwarmOptionsList.Power then -- if the player is the target the button displays
                    SwarmMagicButton:Show()
                    SwarmMagicButton:SetMovable(true)
                elseif testTargetOnList(getTargetDetails()) and not SwarmOptionsList.Paused and SwarmOptionsList.Power then
                    SwarmMagicButton:Show()
                    SwarmMagicButton:SetMovable(false)
                    SwarmMagicButton:Disable()
                    if CheckInteractDistance("target", 4) then
                        SwarmMagicButton:Enable()
                    end
                end
            end
        else
            SwarmMagicButton:Hide()
        end
        SwarmMagicButton:SetScale(SwarmOptionsList.ButtonScale)
    end
)
SwarmInterfaceFrame:RegisterEvent("PLAYER_LOGIN") -- fires when a player logs in or reloads
SwarmInterfaceFrame:RegisterEvent("PLAYER_ENTERING_WORLD") -- fires when the player sees a loading screen
SwarmInterfaceFrame:RegisterEvent("PLAYER_TARGET_CHANGED") -- fires when the player target changes
InterfaceOptions_AddCategory(SwarmInterfaceFrame)

I am looking for some help in fixing and understanding what has happened here.

Cheers